Harding Formation (Ordovician of the United States)

Where: Colorado (38.0° N, 105.0° W: paleocoordinates 14.9° S, 74.0° W)

• local area-level geographic resolution

When: Harding Formation, Caradoc (460.9 - 449.5 Ma)

• formation-level stratigraphic resolution

Environment/lithology: marine; sandstone and shale

• Sandstone: medium- and fine-grained, platy weathering, pinkish-white and greenish-white, slightly silty and argillaceous.
Shale: finely laminated, green, brown, maroon, silty, sandy, abundant fossils, waxy.

Primary reference: W. C. Sweet. 1954. Harding and Fremont Formations, Colorado. Bulletin of the American Association of Petroleum Geologists 38(2):284-305 [S. Holland/T. Hanson]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 10380: authorized by Steven Holland, entered by Tori Hanson on 11.04.2001, edited by Steven Holland and Austin Hendy

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Phacopida - Pterygometopidae
Isalaux canyonensis Frederickson and Pollack 1952 trilobite
 Proetida - Dimeropygidae
Toernquistia sp. Chatterton and Edgecombe 1998 trilobite
Lingulata
 Lingulida - Obolidae
"Lingula hurlbuti" = Lingula (Palaeoglossa) hurlbuti
"Lingula hurlbuti" = Lingula (Palaeoglossa) hurlbuti Winchell 1880
 Lingulida - Lingulidae
Lingula huronensis Billings 1859
Bivalvia
 Cyrtodontida - Cyrtodontidae
Cyrtodonta sp. Billings 1858 clam
 Modiomorphida - Modiomorphidae
Modiolopsis spp. Hall 1847 clam
Orthodesma sp. Hall and Whitfield 1875 clam
 Protobranchia - Ctenodontidae
Ctenodonta spp. Salter 1852 clam
Gastropoda
 Euomphalina - Holopeidae
"Ecculiomphalus contiguus" = Pachystrophia contiguus
"Ecculiomphalus contiguus" = Pachystrophia contiguus Ulrich and Scofield 1897 snail
 Murchisoniina - Eotomariidae
Liospira sp. Ulrich and Scofield 1897 snail
Cephalopoda
 Orthocerida - Kionoceratidae
Kionoceras sp. Hyatt 1884
 Actinocerida - Ormoceratidae
Pteraspidomorpha
 Astraspidiformes -
 Astrapidiformes - Astraspididae
"Astraspis desiderata" = Astraspis desiderata, "Astraspis splendens" = Astraspis desiderata
"Astraspis desiderata" = Astraspis desiderata Walcott 1892
"Astraspis splendens" = Astraspis desiderata Walcott 1892
unclassified
  -
Vertebrata indet. Lamarck 1801
Conodonta
 Prioniodontida -
 Prioniodontida - Balognathidae
Amorphognathus sp. Branson and Mehl 1933 conodont
undescribed n.sp.
Chondrichthyes
 Chimaeriformes - Chimaeridae
Dictyorhabdus priscus Walcott 1891 chimaera