Mazon Creek, Illinois


Bivalvia

"Worms"

Xiphosura

Crustacea

Hexapoda

Myriapoda

Echinodermata

Incertae Sedis

Another example of spectacular fossil preservation occurs south of Chicago, Illinois in an area named for a local river: Mazon Creek. Fossils can be found in ironstone concretions in the exposures along the creek and in spoil pits from coal mining operations. Not only are articulated skeletons preserved, but soft-bodied organisms are fossilized as well. In 1864, Yale's James Dana was the first to describe any of the plants or animals from Mazon Creek.


Bivalvia

Aviculopecten mazonensis Worthen, YPM 14455
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"Worms"

Annelida
undet. Annelida, YPM 36982
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Arthropoda

Chelicerata [back to top]

Crustacea
Acanthotelson stimpsoni Meek & Worthen, YPM 19692
Acanthotelson stimpsoni Meek & Worthen, YPM 19906
Anthracaris gracilis Meek & Worthen, YPM 19979
Palaeocaris typus Meek & Worthen, YPM 19729
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Hexapoda
Archoblattina beecheri (Sellards), YPM 8412
Asyncritus reticulatus Handlirsch, YPM 44
Narkema taeniatum Handlirsch, YPM 40
Syntonoptera schucherti Handlirsch, YPM 19
Spaniodera angusta Handlirsch, YPM 30
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Myriapoda

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Echinodermata

Echinozoa [back to top]


Incertae Sedis

Mazon Creek Problematica, YPM 34121
Mazon Creek Problematica, YPM 34122
Tullimonstrum gregarium Richardson, YPM 10057
Tullimonstrum gregarium Richardson, YPM 10058
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