User Options
Toggle navigation
Login
Register
Login
Register
Main Site
Browse
Advanced Search
Featured
About
3 Specimen Results
Add all results to lightbox
Select results to add to lightbox
Sort by:
Title
Sort order:
Ascending
Descending
Start Over
Download results as:
Checklist
PDF (thumbnails)
Specimen information (Excel)
Add selected results to lightbox
Period:
Ordovician
State/Province:
Colorado
FHSM IP-131
Helicotoma
(Salter, 1859)
Period(Early):
Ordovician
FHSM VP-2211
Archeognathus primus
(Cullison, 1938)
Formation:
Harding
Period(Early):
Ordovician
FHSM VP-2212
Astraspis
(Walcott, 1892)
Formation:
Harding
Period(Early):
Ordovician
Next 36
Filter by
Phylum
Chordata (2)
Mollusca (1)
Order
(1)
Astrapidiformes (1)
Euomphalina (1)
Class
Conodonta (1)
Gastropoda (1)
Pteraspidomorpha (1)
Family
Archeognathidae (1)
Astraspididae (1)
Helicotomidae (1)
Genus
Archeognathus (1)
Astraspis (1)
Helicotoma (1)
Individual/Organization
Zakrzewski, R.J. (1)
Wooster, L.C. (1)
Bonner, O.W. (2)
Klapper, G. (1)
Period
Ordovician (3)
Formation
Harding (2)
Country
United States of America (3)
County
El Paso (1)
Freemont (2)