While researching a mystery fossil that looks like flower petal indentations, I came across jellyfish imprints described as medusa. The image above is of a Cambrian aged Dactyloidites asteroides (Fitch, 1850). Image is from Charles D. Walcott (1850-1927) and was re-published as figure 1012 on page 228 A Textbook of Geology Part II Historical Geology by Amadeus W. Grabau (1870-1946).
PDF of book can be found:
https://archive.org/details/textbookofgeolog02grabrich/page/n5/mode/2up
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