Tag Archives: illinois

Wooster’s Fossils of the Week: Peanut worms from the Silurian of Illinois

This week’s fossils are a set of cool sipunculan worms from the Lockport Shale Member of the Racine Formation (Wenlockian, Silurian) of Blue Island, Illinois (which, it turns out, is not an island.). This is Lecthaylus gregarius Weller, 1925. (There … Continue reading

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Wooster’s Fossil of the Week: A blastoid from the Lower Carboniferous of Illinois

It is sometimes hard to believe that exquisite fossils such as the above are sometimes very common. The above is a theca of the blastoid Pentremites godoni (DeFrance, 1819) found in the Lower Carboniferous (Mississippian) of Illinois. (Thanks to expert … Continue reading

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Wooster’s Fossil of the Week: A Tully Monster! (Late Carboniferous of Illinois)

We have several examples of one of the strangest fossils known: Tullimonstrum gregarium Richardson 1966 — otherwise affectionately known as the Tully Monster. The above specimen is from the Francis Creek Shale Member (Carbondale Formation) at Mazon Creek near Chicago, … Continue reading

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