Ascot Formation (younger), Perth Basin (Pliocene of Australia)

Where: Western Australia, Australia (32.1° S, 115.9° E: paleocoordinates 34.1° S, 114.8° E)

• local area-level geographic resolution

When: Ascot Formation, Late/Upper Pliocene (3.6 - 2.6 Ma)

• STRATIGRAPHIC RELATIONS: Unconformably overlies Albian-Cenomanian Osborne Fm (Cockbain 1980). Minor transitional units (Balme 1980) separate the top of the Ascot Fm from both the Bassendean Sand and the Guildford Fm (Low 1971; Playford et al. 1976) THICKNESS: Approximately 20 m in figure well logs. AGE: Extended discussion of age in text (Kendrick et al., 1991), but generally regarded as Late Pliocene on the basis of molluscan and foraminiferal biostratigraphy, well-dated presumed correlatives and the age of bounding units. Correlated to Darragh's (1985) Molluscan Assemblage XVIII. STRATIGRAPHIC POSITION: From "younger" Ascot Formation, presumably lower in the stratigraphic succession, or encountered in shallow wells further down dip.

• bed-level stratigraphic resolution

Environment/lithology: coastal; unlithified, brown, gray, yellow, calcareous sandstone

• ENVIRONMENT: Environmental data not reported. Presumably shallow water, siliciclastic fauna.
• SPECIFIC LITHOLOGY: Very coarse, grey to yellow-brown quartz sands with subordinate carbonate and less frequently quartzose calcarenites. LITHIFICATION: Presumed to be unlithified given age, siliciclastic nature and limited carbonate.

Size class: macrofossils

Preservation: original aragonite, original calcite

Collection methods: quarrying,

• COLLECTOR: Faunal list is a composite of decades of collecting effort, including that reported by Darragh and Kendrick (1971), Kendrick (1981), Ponder (1985), and Kendrick unpublished data. REPOSITORY: Collection assembled from material reposited in Western Australian Museum (WAM).

Primary reference: G. W. Kendrick, K.-H. Wyrwoll, and B.J. Szabo. 1991. Pliocene-Pleistocene coastal events and history along the western margin of Australia. Quaternary Science Reviews 10:419-439 [A. Miller/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 63353: authorized by Austin Hendy, entered by Austin Hendy on 11.08.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• COMPLETENESS: Not exhaustive (stated to be selective, presumably on the basis of biogeographic utility of taxa), but certainly comprehensive. NOMENCLATURE: Not an authoritative publication, but nomenclature appears modern with extensive subgeneric and species-level assignments.
 Arcida - Arcidae
Arca ventricosa Lamarck 1819 ark
 Arcida - Glycymerididae
Glycymeris "sp. A" Da Costa 1778 clam
Glycymeris "sp. B" Da Costa 1778 clam
 Arcida - Noetiidae
 Arcida - Limopsidae
 Pectinida - Pectinoidae
Pecten sp., "Chlamys (Equichlamys) bifrons" = Equichlamys bifrons
Pecten sp. Müller 1776 scallop
"Chlamys (Equichlamys) bifrons" = Equichlamys bifrons Lamarck 1819 scallop
Subspecies: C. (E.). bifrons bifrons
 Carditida - Carditidae
Carditidae indet. Fleming 1820 clam
Cardita crassicosta Lamarck 1819 clam
 Cardiida - Mesodesmatidae
Anapella cycladea Lamarck 1818 clam
 Cardiida - Mactridae
Mactra "sp. B" Linnaeus 1767 clam
 Cardiida - Veneridae
Tawera "sp. A" Marwick 1927 venus clam
Tawera "sp. B" Marwick 1927 venus clam
Katelysia rhytiphora Lamy 1937 venus clam
Katelysia scalarina Lamarck 1818 venus clam
Anomalocardia sp. n. sp. Schumacher 1817 venus clam
Placamen placidum venus clam
 Cardiida - Donacidae
 Cardiida - Tellinidae
Strigilla sp. Turton 1822 tellin clam
"Tellina (Pseudarcopagia) basedowi" = Macomona basedowi Tate 1901 tellin clam
Tellina (Pseudarcopagia) victoriae Gatliff 1914 tellin clam
Tellina (Tellinella) sp. Mörch 1853 tellin clam
 Lucinida - Lucinidae
 Nuculida - Nuculidae
"Leionucula kalimnae" = Nucula (Leionucula)
"Leionucula kalimnae" = Nucula (Leionucula) nut clam
 Protobranchia - Nuculanidae
Nuculana (Scaeoleda) sp. n. sp. Iredale 1924 pointed nut clam
Nuculana (Scaeoleda) crassa pointed nut clam
 Neogastropoda - Olividae
"Oliva australis" = Oliva (Strephona) australis Duclos 1835 olive snail
 Neogastropoda - Nassariidae
Nassarius sp. n. sp. Duméril 1806 snail
 Neogastropoda - Cancellariidae
 Neogastropoda - Volutidae
Lyria mitraeformis Lamarck 1811 volute
Subspecies: L. mitraeformis mitraeformis
 Neogastropoda - Muricidae
Bedeva paivae Crosse 1864 murex snail
 Neogastropoda - Conidae
Conus anemone cone shell
 Stromboidea - Strombidae
"Fusus bednalli" = Rostellaria (Fusus)
"Fusus bednalli" = Rostellaria (Fusus) true conch
 Stromboidea - Struthiolariidae
Tylospira sp. n. sp. Harris 1897 snail
 Littorinoidea - Littorinidae
 Naticoidea - Naticidae
Natica gualteriana Récluz 1843 moon snail
 Tonnoidea - Ranellidae
Cabestana tabulata triton shell
Subspecies: C. tabulata tabulata
 Tonnoidea - Cassidae
Semicassis pyrum Lamarck 1822 snail
 Rissooidea - Rissoidae
 Sorbeoconcha - Campanilidae
Campanile symbolicum Iredale 1917 snail
 Sorbeoconcha - Litiopidae
 Sorbeoconcha - Turritellidae
Gazameda iredalei Finlay 1927 turret shell
 Sorbeoconcha - Cerithiidae
"Semivertagus subcalvatus" = Clava (Semivertagus), Bittium icarus
"Semivertagus subcalvatus" = Clava (Semivertagus) cerith snail
Bittium icarus cerith snail
 Neritoidea - Neritidae
Nerita atramentosa Reeve 1855 snail
 Haliotoidea - Haliotidae
 Turbinoidea - Turbinidae
Turbo (Ninella) torquatus Gmelin 1791 snail
 Trochoidea - Trochidae
Solariella (Spectamen) "sp. B" Wood 1842 top snail
Leiopyrga "sp. B" Adams 1863 top snail
Donax (Plebidonax) deltoides