| Top--Sponges called scientifically, genus
Amblysiphonella; from the upper Pennsylvanian Frisbie
Limestone, Kansas City Group of the Missourian Stage--306.5 to
305.5 million years old. Bottom photograph: Sponges called scientifically,
genus Girtyocoelia from the upper Pennsylvanian Hickory
Creek Shale, Lansing Group of the Missourian Stage--305.5 to
305 million years old. All the specimens in the two images were
collected and photographed by an individual who goes by the cybername
of "Missourian." |
