S170/f593 - Pomahaka Estuarine bed, Pomahaka River (Oligocene of New Zealand)

Also known as GS 4876

Where: Southland, New Zealand (46.0° S, 169.0° E: paleocoordinates 52.1° S, 176.9° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Pomahaka Formation, Late/Upper Oligocene (28.4 - 23.0 Ma)

• Duntroonian local stage = Chattian stage (Late Oligocene). Named the "Pomahaka Estuarine Bed"....really a correlative unit of the Chatton Marine Formation.

• bed-level stratigraphic resolution

Environment/lithology: marginal marine; unlithified, shelly/skeletal, brown, gray mudstone

• Contains fauna typical of brackish-water conditions.
• Brown and grey carbonaceous mudstone. Bright-blue when freshly exposed but weathers brown.

Size class: macrofossils

Reposited in the BMNH

Collection methods: quarrying,

• Collected by Wood, identified by J. Marwick. Collection likely reposited in Institute of Geological and Nuclear Sciences (NZ Geologic Survey) collections.

Primary reference: B.L. Wood. 1956. The Geology of the Gore Subdivision. New Zealand Geological Survey Bulletin 53 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 50787: authorized by Austin Hendy, entered by Austin Hendy on 22.05.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for mollusca. Nomenclature revised by A, Hendy (2005) - PhD thesis.
 Arcida - Arcidae
"Arca" sp. n. sp.
"Arca" sp. n. sp. Linnaeus 1758 ark
n. sp.
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
 Cardiida - Veneridae
Eumarcia sp. n. sp. Iredale 1925 venus clam
n. sp.
 Neogastropoda - Buccinidae
Pomahakia aberrans Finlay 1927 true whelk
 Neogastropoda - Turridae
aff. Pseudomelania sp. Pictet and Campiche 1862 turrid
Listed as "n. gen. n. sp. ?aff. Pseudomelania"
 Sorbeoconcha - Turritellidae
Batillona amara Finlay 1927 turret shell