Unnamed Silurian Limestone, The Gap Area, New South Wales (Silurian of Australia)

Where: New South Wales, Australia (34.0° S, 148.8° E: paleocoordinates 5.8° N, 174.2° E)

• coordinate estimated from map

• local area-level geographic resolution

When: Silurian (443.4 - 419.2 Ma)

• "The association [of fossils] is consistent with a Late Silurian age."

• formation-level stratigraphic resolution

Environment/lithology: marine; gray lime mudstone and gray grainstone

• See lithology.
• "In the SE of the area, a strongly outcropping Lst sequence of predominantly light grey calcilutites with minor mid-grey calcisiltites overlies a thick sequence of red shales. Overlying these limestones are red and fawn siltstones with some thin beds of sandstone and limestone. Farther north, in "Blind Gully", west of the track crossing, outcrops grade from very dark grey to black siltstones and shales into grey shales. The unites then become cherty with light and dark banding; some fossiliferous bands are present...these are overlain, perhaps conformably, byt he ?Camelford Limestone. In the NE corner of the mapperd area, the Lsts underlie a low grade metadolerite. The Lsts here are mid-grey and contain a fine silicified fauna .."

Preservation: replaced with silica

Primary reference: J. R. Farrell. 1992. The Garra Formation (Early Devonian: Late Lochkovian) between Cumnock and Larras Lee, New South Wales, Australia: stratigraphic and structural setting, faunas, and community sequence. Palaeontographica Abteilung A 222(1-3):1-41 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 25723: authorized by Michael Foote, entered by Michael Foote on 24.09.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Anthozoa
 Auloporida - Syringoporidae
Syringopora sp. Goldfuss 1826 tabulate coral
 Favositida - Favositidae
Favosites sp. Lamarck 1816 tabulate coral
 Favositida - Pachyporidae
"Trachypora sp." = Thamnoptychia, Cladopora sp.
"Trachypora sp." = Thamnoptychia Hall 1876 tabulate coral
Cladopora sp. Hall 1851 tabulate coral
 Favositida - Alveolitidae
Alveolites sp. Lamarck 1801 tabulate coral
Gastropoda
 Euomphalina - Platyceratidae
Platyceratidae indet. Hall 1859 snail
Strophomenata
 Strophomenida - Rafinesquinidae
Leptaena sp. Dalman 1828
Rhynchonellata
 Orthida - Dolerorthidae
Dolerorthidae indet. Opik 1934
new genus
 Orthida - Hesperorthidae
Hesperorthis sp. Schuchert and Cooper 1931
 Atrypida - Atrypidae
Atrypa sp. Dalman 1828
 Spiriferida - Cyrtiidae
Hedeina sp. Boucot 1957
 Athyridida - Retziellidae
Trilobita
 Phacopida - Encrinuridae
Encrinurus sp. Emmrich 1844 trilobite