Two Sponge holdfasts
found in St. Louis County, Missouri
Pennsylvanian - images 1-4
Mississippian - image 5
Pennsylvanian
Altamont Formation
St. Louis Louis County, Missouri
1
2
3
4
Pennsylvanian Sponge
holdfast
Mississippian
Warsaw
Formation
St. Louis Louis County, Missouri
5
Mississippian Sponge holdfast
Barry Sutton
Thanks to Steve Pavelsky for the identification
Viewer Comments #1
These are sponge holdfasts. I have one too from the
Warsaw fm.
They are not uncommon. Silica/pyrite/marcasite replacement common.
Steve Pavelsky
Viewer Comments #2
Very interesting specimen. Identification as a sponge
holdfast
is reasonable. Note the long straight spicules. This is a variant.
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Because the images of the Pennsylvanian specimen are
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St. Louis Pennsylvanian Fossils
of the Altamont Formation
web site, permission is required to use the images in other publications.
Barry Sutton
BGSutton@LakeNeosho.org