Gracianella graciosa Community, Prague Basin (Silurian of Czech Republic)

Where: Czech Republic (49.5° N, 13.5° E: paleocoordinates 49.6° S, 55.2° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Monograptus ultimus zone, Pozary Formation, Pridoli (423.0 - 419.2 Ma)

• Pozary Fm. also known as Pridoli Fm.

• formation-level stratigraphic resolution

Environment/lithology: marine; calcareous lime mudstone and shale

• 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: "The presence of abundant graptolites with the shelly benthos suggests a BA 3-4 assignment."

• "marly facies" "...graptolites...occur on bedding planes with shelly fauna..."

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 14113: authorized by Michael Foote, entered by Michael Foote on 15.05.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Skamnomena bassetti
Graptolithina
  -
Graptolithina indet.
Graptolithina indet. graptolite
"Numerous graptolites of the M. ultimus Zone (species listed by Jaeger in Kriz et al. 1986)--need to fill these in
Rhynchonellata
 Rhynchonellida - Innaechiidae
Decoropugnax agatheus
 Atrypida - Atrypinidae
Gracianella graciosa
Gracianella graciosa Havlicek 1990
 Pentamerida - Camerellidae
Bleshidium triste
 Pentamerida - Gypidulidae
Cadudium sp.
 Athyridida - Nucleospiridae
Nucleospira bubovica
Trilobita
  -
Trilobita indet.
Trilobita indet. Walch 1771 trilobite
 Proetida - Tropidocoryphidae
Eremiproetus senex
 Proetida - Proetidae
"Prionopeltis striata" = Phaetonides striatus, Prionopeltis unica
"Prionopeltis striata" = Phaetonides striatus Barrande 1846 trilobite
Prionopeltis unica Šnajdr 1976 trilobite
 Phacopida - Encrinuridae
Encrinuraspis testosteron
 Phacopida - Cheiruridae
Crotalocephalus transiens
Deuteropoda
  -
Ostracoda indet.
Ostracoda indet. Latreille 1802 ostracod