Black Dam (Cretaceous of Australia)

Also known as Cardabia Creek

Where: Western Australia, Australia (24.5° S, 113.6° E: paleocoordinates 48.6° S, 85.5° E)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Gearle Siltstone Formation, Albian (113.0 - 100.5 Ma)

• "middle to late Albian" based on shark fauna and the formation is "late early Albian... very close to its base"

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; argillaceous siltstone

• "offshore-marine... inner-shelf... inner to mid-neritic water depths and normal to near-normal oceanic salinity levels"
• formation consists of "predominantly dark, argillaceous siltstone, grading to silty bentonitic claystone" (either unlithified or poorly lithified)

Size classes: macrofossils, mesofossils

Collected by M. Siverson, K. Brimmell, A. Baynes in 1994, 1995

Collection methods: salvage, surface (float),

• Western Australia Museum collection

•recovered from sediments that now "make up the walls of the dam" and were excavated during its construction

•"processing a 5 kg bulk sample did not yield any microscopic teeth"

Primary reference: M. Siverson. 1997. Sharks from the mid-Cretaceous Gearle Siltstone, Southern Carnarvon Basin, Western Australia. Journal of Vertebrate Paleontology 17(3):453-465 [J. Alroy/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 90688: authorized by John Alroy, entered by John Alroy on 12.08.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

 Lamniformes - Anacoracidae
Squalicorax primaevus Dalinkevicius 1935 crow shark
 Lamniformes - Archaeolamnidae
Archaeolamna sp. Siverson 1992 mackerel shark
 Lamniformes - Eoptolamnidae
Leptostyrax sp. Williston 1900 mackerel shark
 Lamniformes - Cretoxyrhinidae
Cretoxyrhinidae indet. Gl├╝ckman 1958 mackerel shark
Paraisurus aff. compressus Sokolov 1978 mackerel shark
Cretolamna sp. Glikman 1958 mackerel shark
 Lamniformes - Odontaspididae
Carcharias striatula Dalinkevicius 1935 sand shark
 Euselachii -
Orectolobiformes indet. Applegate 1972 carpet shark
said to be a new genus
 Synechodontiformes - Paraorthacodontidae
Paraorthacodus sp. Glikman 1957 elasmobranch
 Hexanchiformes - Hexanchidae
"Notorynchus aptiensis" = Gladioserratus aptiensis
"Notorynchus aptiensis" = Gladioserratus aptiensis Pictet 1865 cow shark