Alum Bay, Lower Barton Beds, Isle of Wight (Eocene of the United Kingdom)

Also known as "London Clay" (lowest bed)

Where: England, United Kingdom (50.7° N, 1.6° W: paleocoordinates 49.1° N, 5.5° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Lower Member (Barton Beds Formation), Late/Upper Eocene (37.2 - 33.9 Ma)

• Bowerbank's unit 9 (numbered from top to bottom), the lowermost in the "London Clay" series here. No one else has recognized the London Clay in this area. This bed is probably part of the Barton Beds (Bosma, 1974). Bowerbank gives the thickness of this bed as 83 paces. Gardner et al. are the first I've found who call these Barton Beds.

• bed-level stratigraphic resolution

Environment/lithology: marine; shelly/skeletal, sandy claystone

• "London clay, commencing with a band abounding with Nummulites and minute shells"

Size class: macrofossils

Collection methods: Bowerbank's bed and outcrop descriptions don't match with Prestwich's (see note in collection 39696), this bed is perhaps the one that should jive with 39696. The bed orientation is vertical (per strat column in Bowerbank) so perhaps someone is turned around.

Primary reference: J. S. Bowerbank. 1839. On the London and Plastic Clay Formations of the Isle of Wight. Transactions of the Geological Society of London, series 2 6:169-172 [J. Alroy/E. Leckey/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 40777: authorized by John Alroy, entered by Erin Leckey on 30.06.2004, edited by Lerin Baltzly

Creative Commons license: CC BY (attribution)

Taxonomic list

 Nummulitacea - Nummulitidae
 Decapoda - Chasmocarcinidae
Orthakrolophos depressus2 Quayle and Collins 1981 crab
Horizon A2
 Decapoda - Xanthidae
Cyclocorystes vulgatus2 Quayle and Collins 1981 stone crab
Horizon A2 and A3
 Neogastropoda - Buccinidae
 Neogastropoda - Mitridae
Mitra parva1 mitre shell