Bumastus-Sphaerexochus-Cheirurus Assemblage, Prague Basin (Silurian of Czech Republic)

Where: Czech Republic (50.0° N, 14.1° E: paleocoordinates 56.3° S, 61.3° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Motol Formation, Sheinwoodian (433.4 - 430.5 Ma)

• Zones Monograptus flexilis to M. testis (i.e. Testograptus testis).

• formation-level stratigraphic resolution

Environment/lithology: marine; shelly/skeletal, gray grainstone

• "The composition of the assemblage, fragmentation of organic remains, and lithology point to a shallow water subtidal up to possibly intertidal environment in areas of active volcanic elevations. BA 3 or up to 2."
• "Trilobite-rich light to dark grey biodetrital bituminous limestones form lenses and local layers within the volcano-carbonate facies, being commonly surrounded and intercalated by volcanoclastic rocks and lava flows."

Primary reference: I. Chlupac. 1987. Ecostratigraphy of Silurian trilobite assemblages of the Barrandian area, Czechoslovakia. Newsletters on Stratigraphy 17(3):169-186 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 14123: authorized by Michael Foote, entered by Michael Foote on 15.05.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

• Only trilobites are listed to genus level, but many other groups reported present.
Show authors, comments, and common names
unclassified
  -
Staruocephalus murchisoni
Scyphozoa
 Conulariida -
Conulariida indet.
Conulariida indet. Miller and Gurley 1896 jellyfish
Anthozoa
  -
Anthozoa indet.
Anthozoa indet. Ehrenberg 1834
Bryozoa
  -
Bryozoa indet.
Bryozoa indet. Ehrenberg 1831
Brachiopoda
  -
Brachiopoda indet.
Brachiopoda indet. Cuvier 1805
Rhynchonellata
 Spiriferida -
Spiriferida indet.
Spiriferida indet. Waagen 1883
 Atrypida -
Atrypida indet.
Atrypida indet. Rzhonsnitskaya 1960
Strophomenata
 Strophomenida -
Strophomenida indet.
Gastropoda
  -
Gastropoda indet.
Gastropoda indet. Cuvier 1795 snail
Bivalvia
  -
"Pelecypoda indet." = Bivalvia
"Pelecypoda indet." = Bivalvia Linnaeus 1758 clam
Cephalopoda
 Nautiloidea -
Nautiloidea indet.
Nautiloidea indet. Agassiz 1847 nautiloid
Trilobita
 Odontopleurida - Odontopleuridae
Miraspis mira, Leonaspis dormitzeri, Leonaspis propinqua, Acidaspis grayi, Ivanopleura dufrenoyi
Miraspis mira Barrande 1846 trilobite
Acidaspis grayi trilobite
 Phacopida - Cheiruridae
Deiphon fleur, Cheirurus insignis, Cheirurus obtusatus, Sphaerexochus sp.
Deiphon fleur trilobite
Sphaerexochus sp. Beyrich 1845 trilobite
 Phacopida - Phacopidae
Eophacops trapeziceps
 Phacopida - Calymenidae
Diacalymene diademata
 Corynexochida - Illaenidae
Bumastus bouchardi
 Proetida - Tropidocoryphidae
Decoroproetus mirificus, Decoroproetus decorus
Decoroproetus decorus Barrande 1846 trilobite
 Proetida - Proetidae
Interproetus vertumnus
 Proetida - Aulacopleuridae
Aulacopleura soror, Nitidocare nitidum
 Lichida - Lichidae
Dicranopeltis scabra, Hemiarges ambiguus, Trochurus speciosus
Dicranopeltis scabra Beyrich 1845 trilobite
Trochurus speciosus Beyrich 1845 trilobite
Deuteropoda
  -
Ostracoda indet.
Ostracoda indet. Latreille 1802 ostracod
Graptolithina
  -
Graptolithina indet.
Crinoidea
  -
Crinoidea indet.
Crinoidea indet. Miller 1821 Sea lily
Prototaxites
  -
Prototaxites sp.
Prototaxites sp. Dawson 1859
Chlorophyceae
  - Receptaculitidae
Ischadites sp.
Ischadites sp. Eichwald 1861