Also known as Antelope Valley
Where: Madison County, Montana (45.8° N, 111.8° W: paleocoordinates 9.8° S, 45.7° W)
• coordinate stated in text
• small collection-level geographic resolution
When: Sappington Formation, Kinderhookian (358.9 - 352.0 Ma)
• bed-level stratigraphic resolution
Environment/lithology: marginal marine; lithified, argillaceous, silty shale and silty, sandy sandstone
Size class: mesofossils
• Blastoids some with attached stems and brachioles.
Preservation: original calcite
Collection methods: quarrying, surface (float), mechanical,
Primary reference: J. Sprinkle and R. C. Gutschick. 1967. Costatoblastus, a channel fill blastoid from the Sappington Formation of Montana. Journal of Paleontology 41(2):385-401 [J. Alroy/M. Sommers/J. Alroy]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 123117: authorized by John Alroy, entered by David Mathieson on 11.01.2012
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
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Branchiopoda | |
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Ostracoda | |
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Rhynchonellata | |
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Strophomenata | |
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Lingulata | |
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Crinoidea | |
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Blastoidea | |
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