Cuttings on A.N.M. road at The Gap (Ordovician to of Australia)

Where: Tasmania, Australia (42.7° S, 146.5° E: paleocoordinates 10.0° N, 166.1° W)

• local area-level geographic resolution

When: Mt. Field Siltstone Member (Florentine Valley Limestone Formation), Lancefieldian to Lancefieldian (484.3 - 473.1 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: shoreface; lithified, glauconitic, calcareous sandstone and siltstone

• Lithology varies somewhat with locality and stratigraphic position within the formation; lithology generally described as a mixture of quartzose and calcareous siltstone, impure nodular limestone, chert, and minor glauconitic shale. Represents the base of a transgressive sequence that continues into overlying Gordon Limestone Group; base in most areas is coarse quartz sandstone with worm borrows and snails, ripple marks, load casts, and trough cross-bedding.

Size classes: macrofossils, mesofossils

Primary reference: K. D. Corbett and M. R. Banks. 1974. Ordovician stratigraphy of the Florentine Synclinorium, southwest Tasmania. Papers and Proceedings of the Royal Society of Tasmania 107:207-238 [A. Miller/P. Novack-Gottshall/A. Clement]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 211106: authorized by Pete Wagner, entered by Pete Wagner on 24.06.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

• Taxonomic list a composite of several articles. PJW: I divided the original article into separate lists.
Show authors, comments, and common names
Cystoidea
  -
Cystoidea indet.
Cystoidea indet. von Buch 1846
Pterobranchia
 Graptoloidea - Dichograptidae
Clonograptus sp., Didymograptus cf. mundus
Clonograptus sp. Nicholson 1873 graptolite
 Graptoloidea - Phyllograptidae
Tetragraptus sp.
Tetragraptus sp. Salter 1863 graptolite
 Graptoloidea - Sinograptidae
"Didymograptus gracilis" = Acrograptus gracilis
"Didymograptus gracilis" = Acrograptus gracilis Törnquist 1891 graptolite
Gastropoda
 Euomphalina - Ophiletidae
Lecanospira tasmanensis
Lecanospira tasmanensis Kobayashi 1940 snail
Lingulata
 Lingulida - Obolidae
cf. Schmidtites sp.
cf. Schmidtites sp. Schuchert and LeVene 1929
Strophomenata
 Billingsellida - Polytoechiidae
? Tritoechia careyi, Tritoechia lewisi
Tritoechia lewisi Brown 1948
Trilobita
 Proetida - Hystricuridae
"Hystricurus lewisi" = Tasmanaspis lewisi
"Hystricurus lewisi" = Tasmanaspis lewisi Kobayashi 1940 trilobite
 Proetida - Dimeropygidae
Pseudohystricurus sp.
Pseudohystricurus sp. Ross 1951 trilobite
 Asaphida - Hungaiidae
"Asaphopsis juneensis" = Asaphopsoides florentinensis
"Asaphopsis juneensis" = Asaphopsoides florentinensis Etheridge 1905 trilobite
 Phacopida - Pliomeridae
Cybelopsis sp.
Cybelopsis sp. Poulsen 1927 trilobite
Vermes
 Vermes -
Vermes indet.
Vermes indet. Linnaeus 1758