ammonites
Scyphocrinites-Dayia bohemica Comm., Pridolian part, Prague Basin (Silurian of Czech Republic)

Where: Czech Republic (50.0° N, 14.3° E: paleocoordinates 46.9° S, 53.9° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Pristiograptus transgrediens zone, Pozary Formation, Pridoli (418.7 - 416.0 Ma)

• Pozary Fm. also known as Pridoli Fm.

• formation-level stratigraphic resolution

Environment/lithology: marine; shelly/skeletal grainstone

• General for Pridoli: "The beginning of the Pridoli was marked by a deepening...[shallow Lsts succeeded by micritic Lsts and calc. shales]...Horny discerned two basic lithofacies in the Pridoli Fm., namely the 'marly' lithofacies formed by rhythmic sedimentation of dark micritic limestone alternating with dark calcareous shales, and the 'carbonate' lithofacies of highly fossiliferous, biosparitic Lsts. The boundary between the two units...is not sharp...Due to a gradual shallowing towards the top of the Pridoli, the area of carbonate sedimentation expanded in the upper part of the Pridoli Formation...and persisted into the lowermost Lochkovian..." [carbonate lithofacies overlies marly]

•For this Community: "...Scyphocrinites excavatus Horizon reflects the general shallowing of the basin [brecciated Lst]...The brachiopods are commonly articulated, suggesting a quiet water environment...The Comm. occurs in shallow water plains, in places possibly protected by crinoidal debris bars, in about BA 2-3. Lateral transitions to the cephalopod limestones could be observed..."

• "...thick bedded crinoidal limestones [commonly brecciated], with cephalopod limestone interbeds..." [i.e. it's in the carbonate facies]

Primary reference: V. Havlicek and P. Storch. 1999. Silurian and Lochkovian communities in the Prague basin (Barrandian area, Czech Republic). in A. J. Boucot and J. D. Lawson, eds. Paleocommunities--a case study from the Silurian and Lower Devonian. Cambridge University Press, Cambrdige. 200-228 [M. Foote/M. Foote/M. Foote] more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 14115: authorized by Michael Foote, entered by Michael Foote on 15.05.2002