Lower Ashley Mudstone, McCulloch's Bridge (Eocene of New Zealand)

Also known as LAM

Where: Canterbury, New Zealand (44.8° S, 171.2° E: paleocoordinates 52.1° S, 168.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Ashley Mudstone Formation, Kaiatan (39.1 - 36.7 Ma)

• Lower Ashley Mudstone formation. Kaiatan in age (Late Eocene). Lower 2.5 m of Ashley Mudstone.

• group of beds-level stratigraphic resolution

Environment/lithology: deep-water; poorly lithified, bioturbated, gray, silty, calcareous mudstone

• Offshore lower shelf to slope environments, 150-250 m based on autoecological analyses.
• Pale, grey, bioturbated, calcareous, silty mudstone with sparse macrofossils.

Size class: macrofossils

Collection methods: quarrying,

• Material reposited in IGNS collections (NZ Geol. Surv.). Collected by P.A. Maxwell and others.

Primary reference: P. A. Maxwell. 1992. Eocene Mollusca from the vicinity of McCulloch's Bridge, Waihao River, South Canterbury, New Zealand: Paleoecology and systematics. New Zealand Geological Survey Paleontological Bulletin 65:1-280 [M. Uhen/M. Uhen/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 45036: authorized by Austin Hendy, entered by Austin Hendy on 29.09.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive. Including some type specimens.
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Bivalvia
 Nuculanida - Nuculanidae
Pseudoportlandia tahuia, Saccella semiteres
Pseudoportlandia tahuia Marwick 1942 pointed nut clam
Saccella semiteres Hutton 1877 pointed nut clam
Gastropoda
 Sorbeoconcha - Cypraeidae
Cypraea (? Notoadusta) sp.
Cypraea (? Notoadusta) sp. Linnaeus 1758 cowry
Scaphopoda
 Dentaliida - Dentaliidae
Fissidentalium ? rei
Fissidentalium ? rei Maxwell 1992 tusk shell