Talk:Columbia River Basalt Group

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Comprises

In a recent edit summary: "someone reversed "is comprised of" to "comprises" (which completely changes the meaning)" so simplified wording to "is made up of"

"Comprises" means "is made up of" or "is composed of". "Is comprised of" is flagged as informal or incorrect by many dictionaries. See also wikt:comprise. The "is made up of" wording is fine too though, so no need to change it. -- JHunterJ 20:25, 3 June 2007 (UTC)

better map to upload

also from USGS: http://vulcan.wr.usgs.gov/LivingWith/Historical/LewisClark/Maps/map_columbia_river_flood_basalts.html -Pete (talk) 05:22, 26 June 2008 (UTC)

Yes, time to work on a better map for the introduction. The existing one (also seen below) is not out and out bad – it does show the areal extent of the CRB in the regional context, and is not a bad graphic per se – but it is cluttered with other details not relevant to this article. Also, it would be nice if we could get a similar map that shows the individual units.

• The image at vulcan.wr.usgs.gov is comparable, but the additional text in the image won't work well in the reduced size needed for the lede.
• Camp and Ross have some very nice images in their "Radiating Volcanic Migrations" article at MantlePlumes.org. (And we are arranging permission to use these.) I think fig. 2 would work, though some of the text is not as clear as I would like, and the individual units are not shown.

Update: see File:CRBG_distribution_RVM-2.jpg and File:CRBG_distribution_RVM-5.jpg.

Ooops, had to retract those. Better images coming. 23:13, 2 January 2012 (UTC)

• Camp and Hanan's fig. 5b at [1] is also a likely candidate, esp. as it has the individual units. The drawback is that the shaded-relief background darkens and obscures the image. If someone wanted grab a copy of that and see if the background could be lightened it would be strong candidate.
• There are some good images in PNNL 15221 (where the existing image came from). Fig. 3 (p. 2.3) is esp. good as a graphic, but unfortunately it is illustrating structural features of part of the CRB. Fig. 6b shows individual flows, but again there is a problem with the black background, and small labels. However, I suspect ImageMagick might be able to reduce the background to a nice gray. Perhaps even replace the labels.

There are a few other images (and in multiple versions) out there, but I think none as good as these. Anyone think any of these, or a possibly reworked version, might be an improvement over the existing image? ~ J. Johnson (JJ) (talk) 21:55, 10 December 2011 (UTC)

I have just forwarded the permissions, so we should be good to go with these wonderful images:

File:Columbia_River_Flood-Basalt_Province.jpg

File:CRB-Yellowstone_mantle_plume_model.jpg

~ J. Johnson (JJ) (talk) 00:31, 21 January 2012 (UTC)

Very cool!! Thanks for working on this, JJ! The maps look great. -Pete (talk) 01:24, 21 January 2012 (UTC)

Steens flow

The scientific opinion seems to moving towards the Steens flow being the initial ("oldest") event. Any opinions re updating the article to reflect that? - J. Johnson (JJ) (talk) 18:44, 12 October 2010 (UTC)

Agree. Made a minor chage based on Camp reference, but the whole dating issue needs to be unraveled. Will chat with Steve Reidel at WSU to to determine what he recommends for references.

Thanks for spotting this out of date information - Williamborg (Bill) 20:55, 25 August 2011 (UTC)

Yes, Steve is one of the best people to ask (and I am impressed that you know him). I wonder if he would have any suggestions regarding the article as a whole? - J. Johnson (JJ) (talk) 22:11, 26 August 2011 (UTC)

Not so hard to ask - i'm taking Steve's intro Geology course this term - he seems eminently approachable. And yes, i'm sure he'll have some useful comments on the article - but before asking him to review it, i'm inclined to clean up some of the obviously outdated material. As you pointed out with your comment on Steens, the literature has evolved quite a bit since this article started back on 2006 - and it appears Steens and CRBG are now considered different parts of the same large igneous province. I pulled a bunch of articles today and will try to incorporate some of the more recent material. And update the dates - which are now internally contradictory. I'd appreciate your critiques as this evolves over the next few weeks. Skål - Williamborg (Bill) 06:02, 27 August 2011 (UTC)

Before asking him to review the article, see if he'd suggest what major points ought to be covered. Also, I would suggest converting the article to Harv templates, with which I would be happy to assist. And let me know if need any help finding articles. - J. Johnson (JJ) (talk) 16:55, 27 August 2011 (UTC)

<==
Good idea. Will ask Steve about his view of the major points.

Know that there has been a debate whether Harvard ref (HR) should be the preferred usage, which has gone on unresolved on Wikipedia forever. Myself, i don't have that strong an opinion. Mostly i think references should be used, irrespective of the formatn. However, i can see at least one advantage of HR - it is easier to add material from a reference without having to search for the first use. But the alternative notation works easily enough too. Regardless, if you want to convert the article to Harvard notation, feel free. It will be an interesting exercise for me to adjust.

Skål - Williamborg (Bill) 01:59, 28 August 2011 (UTC)

Okay! It is a lot easier to manage references (and citations) with {{Harv}}. I am also a strong advocate of pulling bibliographic detail out of the text (which makes both the text and the bibliogrpahic detail easier to read and edit) and putting it into a separate References section (which makes it easier to check and groom the references). Also, "named refs" are not congenial for specific citation (e.g., page numbers and such). Fortunately, this article is still small enough that it won't be difficult to convert. I'll try to get to it sooner than later. - J. Johnson (JJ) (talk) 19:31, 28 August 2011 (UTC)

Yikes! You're running well ahead of me!

Several details to sort out. First, I would urge use of {{citation}} templates rather than the {{cite xxx}} family. Second, I find vertical formating of the templates to be much clearer than stringing everything together horizontally (and am going to do that unless you have a strong objection). Third, do you prefer to go with full names? or last names and initials? I have previously tended toward initials, but am feeling more inclined towards full names (when available). There is also a view of going with the style of the original journal. - J. Johnson (JJ) (talk) 21:37, 29 August 2011 (UTC)

Just a little nagging reminder: are you okay using {{citation}} templates rather than the {{cite xxx}} templates? - J. Johnson (JJ) (talk) 21:23, 31 August 2011 (UTC)

Thoughts on article upgrade

Following up on J. Johnson's thoughts with a first order summary of what might be done. Feel free to supplement or revise this list:

1- The evolving understanding including Steens, Picture Gorge et al.

Tie in Steens, Picture Gorge & other coeval basalt flows (using literature) -

• Update map to show flow overlap into Nevada, California & Idaho

  

  example map update

• include Yellowstone hotspot discussion
• Incorporate dike/dyke maps
• Camp & Ross discuss, "The Oregon High Lava Plains represents is a complementary system of propagating rhyolite eruptions contemporaneous with the Snake River Plain propagation since �10 Ma, but in an opposite direction." Incorporate...
• Include timeline showing flows in sequence
• Tie in with Picture Gorge Basalt flows & Fort Rock - Heiken, G. H. (1981). "Geological Survey Circular 838 - Guides to Some Volcanic Terrances in Washington, Idaho, Oregon, and Northern California - A Field Trip to The Maar Volcanoes of the Fort Rock - Christmas Lake Valley Basin, Oregon". United States Geological Survey. Retrieved 2011-08-28. {{cite journal}}: Cite journal requires |journal= (help); Unknown parameter |coauthors= ignored (|author= suggested) (help)

2 - Stratigraphy

Sort out the Ma sequence to the most recent dating/thinking

• Consider Goldschmidt Conference 2005: Field Trip Guide to the Columbia River Basalt Group; accessdate = 2011-08-28 table as a partial resource for the CRBG timing
  
• GEOLOGY OF WASHINGTON - COLUMBIA BASIN for material on depth of flood basalts in Pasco Basin and what lies below...

3 - LIP Context

Put into context as a large igneous province

• Address the controversy about creation
  
• Compare to and contrast with comparable traps (e.g., Deccan and Siberian)

4 - Columbia Gorge & west

Tie in with the Columbia Gorge

• Add photos (e.g., gorge basaltic features like Crown Point, western Oregon basalt features like Silver Falls, & Oregon headlands.

  

  Crown Point in the Columbia River Gorge is Grande Ronde basalt per Bishop

  

  One of the seven Silver Falls - showing differential rates erosion for Grande Ronde lava over sandstone.

• Tualatin Mountains above Portland are comprised of Grande Ronde basalt - check Knudsen, Matt. "Balch Creek Watershed: Good Policy, Poor Performance" (PDF). Portland State University. Retrieved June 3, 2008. {{cite web}}: Unknown parameter |coauthors= ignored (|author= suggested) (help) and Bishop, Ellen Morris (2003). In Search of Ancient Oregon: A Geological and Natural History. Portland, Oregon: Timber Press. ISBN 978-0-88192-789-4.
• Saddle Mountain (Clatsop County, Oregon) is comprised of Grande Ronde basalt Breccia
• Tie in with the Willamette River basin Wallick, Jennifer Rose (2007). "Patterns and Controls on Historical Channel Change in the Willamette River, Oregon, USA" (PDF). United States Forest Service. pp. 495–97. Retrieved August 1, 2010. {{cite web}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
  

5 - Sources

Possible references and resources:

• Goldschmidt Conference 2005: Field Trip Guide to the Columbia River Basalt Group
  
• Martin, B. S.; Petcovic, H. L.; Reidel, S. P. (May 2005), Goldschmidt Conference 2005: Field Trip Guide to the Columbia River Basalt Group (PNNL-15221) (PDF), U.S. Dept. of Energy, Pacific Northwest National Laboratory

A trailing "✗" indicates that a search for a readily accessible copy (such as a pdf) was negative.

A B

• Adams, David C.; Humphreys, Eugene D. (2010), "New constraints on the properties of the Yellowstone mantle plume from P and S wave attenuation tomography", Journal of Geophysical Research, 115 (B12311): 1–18, doi:10.1029/2009JB006864, ISSN 0148-0227 ✗

• Baksi, Ajoy K. (2004), "Ages of the Steens and Columbia River flood basalts and their relationship to extension related calc-alkalic volcanism in eastern Oregon: Discussion", GSA Bulletin, 116: 247–226, doi:10.1130/B25310.1 ✗

See also Baksi, 2006, Discussion

• Baksi, Ajoy K. (2010), "Comment to "Distribution and geochronology of the Oregon Plateau (U.S.A.) flood basalt volcanism: The Steens Basalt Revisited" by M.E. Brueseke et al.", Journal of Volcanology and Geothermal Research, 196: 134–138, doi:10.1016/j.jvolgeores.2010.04.007

• Barry, T.L.; Self, S.; Kelley, S.P.; Reidel, S.; Hooper, P.; Widdowson, M. (2010), "New 40Ar/39Ar dating of the Grande Ronde lavas, Columbia River Basalts, USA: Implications for duration of flood basalt eruption episodes" (PDF), Lithos, 118 (3–4): 213–222, doi:10.1016/j.lithos.2010.03.014

• Bjornstad, Bruce N.; Babcok, R. Scott; Last, George V. (2007), "Flood basalts and Ice Age floods: Repeated late Cenozoic cataclysms of southeastern Washington", in Stelling, Peter L.; Tucker, David S. (eds.), GSA Field Guide 9: Floods, Faults, and Fire: Geological Field Trips in Washington State and Southwest British Columbia, pp. 209–255, doi:10.1130/2007.fld009(10), ISBN 978-0-8137-0009-0 ✗

• Bondre, Ninad R.; Hart, William K. (2008), "Morphological and textural diversity of the Steens Basalt lava flows, Southeastern Oregon, USA: implications for emplacement style and nature of eruptive episode", Bulletin of Volcanology, 70 (8): 999–1019, doi:10.1007/s00445-007-0182-x, ISSN 0258-8900 ✗

• Brown, Kyle B.; McIntosh, Jennifer C.; Baker, Victor R. (2010), "Isotopically‐depleted late Pleistocene groundwater in Columbia River Basalt aquifers: Evidence for recharge of glacial Lake Missoula floodwaters?", Geophysical Research Letters, 37 (L21402), doi:10.1029/2010GL044992, 2010 {{citation}}: |first4= missing |last4= (help); Check |doi= value (help); Missing pipe in: |first4= (help)CS1 maint: numeric names: authors list (link) ✗

• Brueseke, Matthew E.; Heizler, Matthew T.; Hart, William K.; Mertzman, Stanley A. (2007), "Distribution and geochronology of Oregon Plateau (U.S.A.) flood basalt volcanism: The Steens Basalt revisited" (PDF), Journal of Volcanology and Geothermal Research, 161: 187–214, doi:10.1016/j.jvolgeores.2006.12.004

C - E

• Camp, V. E.; Hanan, B. B. (June 2008), "A plume-triggered delamination origin for the Columbia River Basalt Group" (PDF), Geosphere, 4 (3): 480–495, doi:10.1130/GES00175.1

• Camp, Victor E.; Ross, Martin E. (2004), "Mantle dynamics and genesis of mafic magmatism in the intermontane Pacific Northwest" (PDF), Journal of Geophysical Research, 109 (B08204), doi:10.1029/2003JB002838
• Christiansen, R. L.; Foulger, G. R.; Evans, J. R. (2002), "Upper-mantle origin of the Yellowstone hotspot" (PDF), GSA Bulletin, 114 (10): 1245–1256, doi:10.1130/0016-7606(2002)114<1245:UMOOTY>2.0.CO;2

• Coble, Matthew A.; Mahood, Gail A. (2008), "New geologic evidence for additional 16.5–15.5 Ma silicic calderas in northwest Nevada related to initial impingement of the Yellowstone hot spot" (PDF), IOP Conf. Series: Earth and Environmental Science, Collapse Calderas Workshop 3 (1), doi:10.1088/1755-1307/3/1/012002{{citation}}: CS1 maint: date and year (link)

• Coe, Robert S.; Stock, Greg M.; Lyons, John J.; Beitler, Brenda; Bowen, Gabriel J. (2005), "Yellowstone hotspot volcanism in California? A paleomagnetic test of the Lovejoy flood basalt hypothesis", Geology, 33 (9): 697–700, doi:10.1130/G21733.1, ISSN 0091-7613 ✗

• Dodson, Allen; Kennedy, B. Mack; DePaolo, Donald J. (1997), "Helium and neon isotopes in the Imnaha Basalt, Columbia River Basalt Group: Evidence for a Yellowstone plume source", Earth and Planetary Science Letters, 50 (3–4): 443–451 ✗

• Druken, K. A.; Long, M. D.; Kincaid, C. (2011), "Patterns in seismic anisotropy driven by rollback subduction beneath the High Lava Plains" (PDF), Geophysical Research Letters, 38 (L13310), doi:10.1029/2011GL047541

• Durand, Sedelia Rodriguez; Sen, Gautum (2004), "Preeruption history of the Grande Ronde Formation lavas, Columbia River Basalt Group, American Northwest: Evidence from phenocrysts", Geology, 32 (4): 293–296, doi:10.1130/G20109.1 ✗

• Eagar, Kevin C.; Fouch, Matthew J.; James, David E. (2010), "Receiver function imaging of upper mantle complexity beneath the Pacific Northwest, United States" (PDF), Earth and Planetary Science Letters, 297 (1–2): 141–153, doi:10.1016/j.epsl.2010.06.015

F - H

Picture Gorge Basalt photo

Picture Gorge Basalt photo

• Gao, Haiying; Humphreys, Eugene D.; Yao, Huajian; van der Hilst, Robert D. (2011), "Crust and lithosphere structure of the northwestern U.S. with ambient noise tomography: Terrane accretion and Cascade arc development" (PDF), Earth and Planetary Science Letters, 304: 202–211, doi:10.1016/j.epsl.2011.01.033

• Glen, Jonathan M. G.; Ponce, David A. (2002), "Large-scale fractures related to inception of the Yellowstone hotspot" (PDF), Geology, 30 (7): 647–650, doi:10.1130/0091-7613(2002)030<0647:LSFRTI>2.0.CO;2, ISSN 0091-7613

• Hanan, Barry B.; Shervais, John W.; Vetter, Scott K. (January 2008), "Yellowstone plume–continental lithosphere interaction beneath the Snake River Plain" (PDF), Geology, 36 (1): 51–54, doi:10.1130/G23935A.1

• Hartley, M. E.; Thordarson, T. (2009), "Melt segregations in a Columbia River Basalt lava flow: A possible mechanism for the formation of highly evolved mafic magmas", Lithos, 112 (3–4): 434–446, doi:10.1016/j.lithos.2009.04.003 ✗

• Hooper, P. R.; Binger, G. B.; Lees, K. R. (2002), "Ages of the Steens and Columbia River flood basalts and their relationship to extension-related calc-alkalic volcanism in eastern Oregon", Geological Society of America Bulletin, 114: 43–50, doi:10.1130/0016-7606(2002)114<0043:AOTSAC>2.0.CO;2, ISSN 0016-7606

A document was found, but haven't figured out the url.

• Hooper, P. R.; Binger, G. B.; Lees, K. R. (2002), "ERRATA: Ages of the Steens and Columbia River flood basalts and their relationship to extension-related calc-alkalic volcanism in eastern Oregon", GSA Bulletin, 114: 923–924, doi:10.1130/0016-7606(2002)114<0923:AOTSAC>2.0.CO;2, ISSN 0016-7606

• Hooper, P. R.; Conrey, R. M. (1989), "A model for the tectonic setting of the Columbia River basalt eruptions", in Reidel, S. P.; Hooper, P. R. (eds.), Volcanism and Tectonicism in the Columbia River Flood-Basalts Province, vol. Special Paper 239, Geological Society of America, pp. 293–306

I-J

• Jarboe, Nicholas A.; Coe, Robert; Glen, Jonathan M.G. (2011), "Evidence from lava flows for complex polarity transitions: the new composite Steens Mountain reversal record", Geophysical Journal International, 186 (2): 580–602, doi:10.1111/j.1365-246X.2011.05086.x ✗

• Jarboe, N. A.; Coe, R. S.; Renne, P. R.; Glen, J. M. G.; Mankinen, E. A. (2008), "Quickly erupted volcanic sections of the Steens Basalt, Columbia River Basalt Group: Secular variation, tectonic rotation, and the Steens Mountain reversal", Geochemistry Geophysics Geosystems, 9 (Q11010), doi:10.1029/2008GC002067 ✗

• Jordan, Brennan T.; Grunder, Anita L.; Duncan, Robert A.; Deino, A. L. (2004), "Geochronology of age-progressive volcanism of the Oregon High Lava Plains: Implications for the plume interpretation of Yellowstone" (PDF), Journal of Geophysical Research, 109 (B10202), Bibcode:2004JGRB..10910202J, doi:10.1029/2003JB002776

K - R

• Lange, Rebecca A. (2002), "Constraints on the preeruptive volatile concentrations in the Columbia River flood basalts", Geology, 30 (2): 179–182, doi:10.1130/0091-7613(2002)030<0179:COTPVC>2.0.CO;2, ISSN 0091-7613 ✗

• Petcovic, Heather L.; Dufek, Josef D. (2005), "Modeling magma flow and cooling in dikes: Implications for emplacement of Columbia River flood basalts" (PDF), Journal of Geophysical Research, 110: B10201, doi:10.1029/2004JB003432

• Peterson, Curt D.; Minor, Rick; Peterson, Gary L.; Gates, Edward B. (2011), "Pre-and post-Missoula flood geomorphology of the Pre-Holocene ancestral Columbia River Valley in the Portland forearc basin, Oregon and Washington, USA", Geomorphology, 129 (3–4): 276–293, doi:10.1016/j.geomorph.2011.02.022 ✗

• Ramos, Frank C.; Wolff, John A.; Tollstrup, Darren L. (2005), "Sr isotope disequilibrium in Columbia River flood basalts: Evidence for rapid shallow-level open-system processes" (PDF), Geology, 33 (6): 457–460, doi:10.1130/G21512.1

• Reidel, Stephen (2006), "Comment on Philpotts and Philpotts (2005): Crystal-mush compaction in the Cohassett flood-basalt flow, Hanford, Washington", Journal of Volcanology and Geothermal Research, 152 (1–2): 189–193, doi:10.1016/j.jvolgeores.2005.11.001 ✗

S-Z

• Scarberry, Kaleb C.; Meigs, Andrew J.; Grunder, Anita L. (2009), "Faulting in a propagating continental rift: Insight from the late Miocene structural development of the Albert Rim fault, southern Oregon, USA" (PDF), Tectonophysics, 488 (1–4): 71–86, doi:10.1016/j.tecto.2009.09.025

• Shervais, J. W.; Hanan, B. B. (24 Sept. 2008), "Lithospheric topography, tilted plumes, and the track of the Snake River–Yellowstone hot spot" (PDF), Tectonics, 27: TC5004, Bibcode:2008Tecto..27.5004S, doi:10.1029/2007TC002181 {{citation}}: Check date values in: |date= (help)

• Sobolev, Alexander V.; Hofmann, Albrecht W.; Jochum, Klaus Peter; Kuzmin, Dmitry V.; Stoll, Brigitte (2011), "A young source for the Hawaiian plume" (PDF), Nature, 476 (7361): 434–437, doi:10.1038/nature10321, PMID 21832996

• Walker, George P.L.; Cañón-Tapia, Edgardo; Herrero-Bervera, Emilio (1999), "Origin of vesicle layering and double imbrication by endogenous growth in the Birkett basalt flow �Columbia river plateau", Journal of Volcanology and Geothermal Research, 88 (1–2): 15–28, doi:10.1016/S0377-0273(98)00112-7, ISSN 0377-0273 {{citation}}: replacement character in |title= at position 99 (help) ✗

• Wolff, J. A.; Ramos, F. C.; Hart, G. L.; Patterson, J. D.; Brandon, A. D. (2008), "Columbia River flood basalts from a centralized crustal magmatic system" (PDF), Nature Geoscience, 1 (3): 177, doi:10.1038/ngeo124

Unfiled

• Egger, Anne E. and Elizabeth L. Miller; Evolution of the northwestern margin of the Basin and Range: The geology and extensional history of the Warner Range and environs, northeastern California; Geosphere, June 1, 2011, v. 7, no. 3, p. 756-773
• Camp, V. E.; Hanan, B. B. (June 2008), "A plume-triggered delamination origin for the Columbia River Basalt Group" (PDF), Geosphere, 4 (3): 480–495, doi:10.1130/GES00175.1
• Lerch, Derek William, Elizabeth Miller, Michael McWilliams and Joseph Colgan; Tectonic and magmatic evolution of the northwestern Basin and Range and its transition to unextended volcanic plateaus: Black Rock Range, Nevada; Geological Society of America Bulletin, March 1, 2008, v. 120, no. 3-4, p. 300-311
• Kamenov, George D., James A. Saunders, Willis E. Hames and Derick L. Unger; MAFIC MAGMAS AS SOURCES FOR GOLD IN MIDDLE MIOCENE EPITHERMAL DEPOSITS OF THE NORTHERN GREAT BASIN, UNITED STATES: EVIDENCE FROM Pb ISOTOPE COMPOSITIONS OF NATIVE GOLD; Economic Geology, November 1, 2007, v. 102, no. 7, p. 1191-1195

6 - Good Article Criteria

Review against good article criteria

• Verify the article has reliable sources – see Wikipedia:Verifiability.
• Verify the topic is treated in an obviously non-neutral way – see Wikipedia:Neutral point of view.
• Resolve and remove cleanup banners that are obviously still valid, including {{cleanup}}, {{wikify}}, {{POV}}, {{unreferenced}} or large numbers of {{fact}}, {{citation needed}}, {{clarifyme}}, or similar tags. (See also {{QF-tags}}.)
• Also {{page numbers needed}}. (J. Johnson (JJ) (talk))

Other comments appreciated - Williamborg (Bill) 15:17, 28 August 2011 (UTC)

Notes & comments

I think there should be more connections to the broader context. E.g., the Yellowstone hotspot (a large, related topic, though the article is deplorable) and other Large igneous provinces, perhaps the Deccan and Siberian Traps specifically. These flows are also central to the scenic attraction of the Columbia Gorge (which has a deplorable Geology section)), and various outcrops on the Oregon coast (which a large population would find of interest). Ah, so much to do! - J. Johnson (JJ) (talk) 19:53, 28 August 2011 (UTC)

Incorporated your thoughts into the above list, which i'll use as a check list... Williamborg (Bill) 23:55, 28 August 2011 (UTC)

• More comments. I see you brought in the Goldschmidt map. I can't complain too much about that map (as I brought it to Wikipedia), but I think there are other maps which better show the CBRG flows, and without the other cluttering details. E.g., see Camp & Ross, Radiating Volcanic Migrations: An example from the Pacific Northwest, U.S.A..

Agree there are better maps. The problem is finding one that is prepared with USG funds or is otherwise in the public domain. Like your suggested map, but would need to find it or recreate it...

It can be a bit of a hassle, but many scientists are willing to contribute their images. I suspect Vic Camp would be willing if he was asked nicely. (It is so gratifying to have images even better than what the journal published. And the small hassle can be deemed character building.) - J. Johnson (JJ) (talk) 20:53, 2 September 2011 (UTC)

• Under LIP I see you struck out "address controversy about creation". Check with Steve about this, but I believe that here it's not so much a "controversy about creation" as a "question about origin". This is where matters get tied into the YSH, which is controversial, and so probably warrants some addressing. Check out The Columbia River Basalts & Yellowstone Hot Spot: A Mantle Plume?, as well as Camp & Ross (above). - J. Johnson (JJ) (talk) 23:25, 30 August 2011 (UTC)

Actually used strikeout only to indicate I've attempted to incorporate it into the article. Quite a bit of work to be done though... thanks for the further recommendations - still quite a ways to go - Williamborg (Bill) 01:15, 31 August 2011 (UTC)

Ah, as in "done". You might find {{done-t}}, or even {{working}}, useful. - J. Johnson (JJ) (talk) 18:53, 31 August 2011 (UTC)

References

Work area

Contents moved to References section in article. - J. Johnson (JJ) (talk) 00:12, 3 September 2011 (UTC)

References; Harv; pages needed.

Notable changes: I have moved the reflist to a new Notes section, populated References with the corrected, augmented, and templated forms of the references previously buried in the main text, replaced all the "named refs" (and merged where appropriate) with a {{Harv}} citation, and checked the links to the references.

I have scattered a few inline tags throughout (as well as leaving in empty "p. ") to highlight that WP:page numbers are needed. (A major failing of relying on individual "named refs" -- specific citation is difficult, so tends to be left off.) Other problems noted in the text. ("That should hold the .....s". :-0 ) - J. Johnson (JJ) (talk) 00:09, 3 September 2011 (UTC)

comparison to Central Atlantic Magmatic Province ??

Before 200Ma, a spreading ridge running east-west through the length of the ancient Tethys ocean gradually opened up that seaway. About 200Ma, the western end of that Mid-Ocean Ridge (MOR) reached, and ran under, the supercontinent of Pangea, between Africa (to the south) and North America (to the north), as indicated in the following figures:

http://imageshack.us/a/img29/4546/insularislands400200mya.png

http://imageshack.us/a/img441/3249/insularislands20050mya.png

Now, about 50Ma, the west coast of North America obducted over another MOR (the east Pacific rise). The spreading ridge underneath the continental crust caused crustal thinning, and minor rifting, generating the Basin and Range province, as well as the Yellowstone hotspot and Columbia River Basalt Group. Thus, the CAMP resembles those continental rift zones, except running perpendicular to the coast (instead of parallel to), and on a larger scale, which successfully rifted Africa from North America. Perhaps rifting is facilitated, by perpendicular incidence, of the spreading zone??

More speculatively, about 95Ma, the Tethys MOR may have been subducted under Eurasia, pulling India, then Africa, northwards towards Eurasia. About that time, northern Africa was flooded, leading to the extinction of large northern African dinosaurs & reptiles, like Spinosaurus, Carcharodontosaurus, Paralititan, Sarcosuchus (according to the BBC documentary Planet Dinosaur). Perhaps a change, from compressive force coming southwards from a MOR into northern African continental crust, before 95Ma; to an extensional force pulling northwards to a Subduction Zone (SZ) before Eurasia; caused the northern African crust to stop thickening, and start thinning, depressing the surface below Tethys-sea level?? 66.235.38.214 (talk) 12:49, 17 October 2012 (UTC)

Yes, all that is very interesting stuff. Do you have a specific question or suggestion regarding this article? ~ J. Johnson (JJ) (talk) 23:14, 17 October 2012 (UTC)

Perhaps people in the field are familiar with scholarly & citable sources? Legitimate geologic connections would benefit the article. 66.235.38.214 (talk) 07:29, 18 October 2012 (UTC)

I am generally in favor of showing contexts and broad connections. "Perhaps" you think this article needs more that? Fine. Can you make a specific suggestion? ~ J. Johnson (JJ) (talk) 18:08, 18 October 2012 (UTC)

External links modified (January 2018)

Hello fellow Wikipedians,

I have just modified one external link on Columbia River Basalt Group. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

• Added archive https://web.archive.org/web/20080514031955/http://volcano.und.edu/vwdocs/volc_images/north_america/crb.html to http://volcano.und.edu/vwdocs/volc_images/north_america/crb.html

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Cheers.—InternetArchiveBot (Report bug) 03:09, 26 January 2018 (UTC)