Description11570 Grand Canyon Fossil Trilobite in Bright Angel Shale (4749628242).jpg
Fossil - trilobite - dolichometoppus productus - alokistocare althea walcott (Fc-123), dolichometopus productus (Fc-122) Family - alokistocaridae, old class - trilobita horizon - ba shale, near base two . <a href="http://www.nps.gov/grca/naturescience/fossils.htm" rel="nofollow">www.nps.gov/grca/naturescience/fossils.htm</a> NPS Photo by Michael Quinn
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FOSSIL - TRILOBITE - DOLICHOMETOPPUS PRODUCTUS - ALOKISTOCARE ALTHEA WALCOTT (FC-123), DOLICHOMETOPUS PRODUCTUS (FC-122) FAMILY - ALOKISTOCARIDAE, OLD CLASS - TRILOBITA HORIZON - BA SHALE, NEAR BASE TWO