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Tropical Illinois

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Ordovician Fossils

This gallery contains images of fossils from the Ordovician Period, 490-443 years ago. Shallow seas covered most of North America furing the Ordovician. During this period, the number of species greatly increased.

Date: 08/31/2005
Size: 10 items
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brachiopods

brachiopods

Onniella meeki

Date: 08/31/2005
Views: 648
brachiopods

brachiopods

Rhynchotrema dentatum

Date: 08/31/2005
Views: 495
conularid

conularid

Conularia gattingeri

Date: 08/31/2005
Views: 830
crinoid

crinoid

Pycnocrinus dyeri

Date: 08/31/2005
Views: 528
nautaloid cephalopod

nautaloid cephalopod

Plectoderas undatus

Date: 08/31/2005
Views: 660
nautiloid cephalopod

nautiloid cephalopod

unknown species

Date: 08/31/2005
Views: 590
rugose coral

rugose coral

Grewingkia canadensis

Date: 08/31/2005
Views: 745
tabulate coral

tabulate coral

Favistella alveolata

Date: 08/31/2005
Views: 515
tentaculitid

tentaculitid

Tentaculites incurvus

Date: 08/31/2005
Views: 737
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