Bear Creek Quarry, (BC5), Chile (Ordovician of the United States)

Where: Washington County, Ohio (38.8° N, 84.2° W: paleocoordinates 27.0° S, 62.3° W)

• coordinate estimated from map

• hand sample-level geographic resolution

When: Climacograptus pygmaeus graptolite zone, Kope Formation, Edenian (460.9 - 449.5 Ma)

• Middle Edenian age. Sample #5 collected. Details on stratigraphy and sedimentation (lithology), and additional details of gastropod and bivalve fauna are included from Novack-Gottshall and Miller (2003) [PBDB reference #18186] and field notes.

• bed-level stratigraphic resolution

Environment/lithology: offshore shelf; lithified, graded, shelly/skeletal wackestone and lithified shale

• Sequence C1 (from Holland and Patzkowsky, 1996)
• Lenticular, fossiliferous wackestone/packstone in shale. Sample is a portion of a wackestone with graded flute cast along bottom.

Size classes: macrofossils, mesofossils

Preservation: mold/impression, recrystallized, original calcite, original carbon, replaced with calcite

Collection methods: bulk, mechanical,

• Bulk collection made in field and weighed, cleaned, prepped, and identified in lab at University of Cincinnati. Sample dimensions are 448.4 square-cm, weighing 893 grams. At least 41 specimens counted; 33 individuals estimated (using half of total disarticulated specimens with two parts plus number of articulated/intact specimens). Fragmented trepostome bryozoans, crinoid columnals, and fragmented trilobites were counted as estimated percent cover using standard percent cover reference chart.

Primary reference: P. M. Novack-Gottshall. 1999. Comparative geographic and environmental diversity dynamics of gastropods and bivalves during the Ordovician Radiation (M.S. thesis, University of Cincinnati). 1-191 [P. Novack-Gottshall/P. Novack-Gottshall/P. Novack-Gottshall]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 64475: authorized by Phil Novack-Gottshall, entered by Phil Novack-Gottshall on 09.09.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• Representative samples (standards) of species used for taxonomic identification reference are stored at the University of Cincinnati. Many unidentifiable bivalves are not included in taxonomic list.
Trilobita
 Phacopida - Calymenidae
Flexicalymene meeki Foerste 1910 trilobite
1 articulated body (lacking cephalon), 1 cephalon, size consistent with association from same specimen
 Asaphida - Asaphidae
Isotelus maximus Locke 1838 trilobite
1 genal spine, another fragment may be a partial cephalon
Strophomenata
 Strophomenida - Rafinesquinidae
Rafinesquina alternata Conrad 1838
6 pedicle valves, 1 brachial valve
Rhynchonellata
 Atrypida - Anazygidae
Zygospira modesta Hall 1847
6 articulated specimens
 Orthida - Dalmanellidae
"Onniella multisecta" = Cincinnetina multisecta
"Onniella multisecta" = Cincinnetina multisecta James 1871
9 pedicle valves
Bivalvia
 Modiomorphida - Modiomorphidae
Modiolopsis modiolaris Conrad 1838 clam
1 disarticulated valve showing carbonized periostracum
Gastropoda
 Trochonematoidea - Lophospiridae
Lophospiridae indet. Wenz 1938 snail
Short, broad lophospirid, possibly Lophospira bowdeni (=Paupospira bowdeni), 9 internal molds
Stenolaemata
 Trepostomata - Halloporidae
Halloporidae "indet. A" Bassler 1911
Encrusting halloporid trepostome, fragments
Halloporidae "indet. B" Bassler 1911
Smooth, thick, branching halloporid bryozoans, fragmented
Halloporidae "indet. C" Bassler 1911
Smooth, thin, branching halloporid trepostome, fragmented
Crinoidea
  -
Crinoidea indet. Miller 1821 Sea lily
Disarticualted columnals