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

Also known as "London Clay" (Bed 29)

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

• Prestwich's stratigraphy is a bit screwy. No one else has recognized the London Clay in this area. This bed is probably part of the Barton Beds (Bosma, 1974). Gardner et al. are the first I've found who call these Barton Beds.

• bed-level stratigraphic resolution

Environment/lithology: marine; shelly/skeletal, black, brown claystone and pebbly, green sandstone

• a black shale with a very few shell s in seams and patches-in descending it becomes browner and very fossiliferous. At one location, is a layer of large septaria underlaid by a seam of small flint pebbles, immediately below which is thirty feel of greensand, in which fossils are extremely scarce-this then passes gradually into a brown clay with numerous shells and remains of Foraminifera, and then again into green sands with a few very small flint pebbles and traces of vegetable matter, but with few shells

Size classes: macrofossils, microfossils

Primary reference: J. Prestwich. 1846. On the Tertiary or SupraCretaceous Formations of the Isle of Wight as exhibited in the sections at Alum Bay and White Cliff Bay. Quarterly Journal of the Geological Society of London 2:233-259 [J. Alroy/E. Leckey/E. Leckey]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 39695: authorized by John Alroy, entered by Erin Leckey on 03.06.2004, edited by Lerin Baltzly

Creative Commons license: CC BY (attribution)

Taxonomic list

 Foraminifera -
 Nummulitacea - Nummulitidae
 Decapoda - Chasmocarcinidae
Orthakrolophos depressus2 Quayle and Collins 1981 crab
Horizon F
 Decapoda - Xanthidae
Cyclocorystes vulgatus2 Quayle and Collins 1981 stone crab
Horizon F
 Arcida - Limopsidae
"Pectunculus scalaris" = Pectunculina scalaris
"Pectunculus scalaris" = Pectunculina scalaris Sowerby 1825 clam
 Ostreida - Ostreidae
Ostrea sp.1 Linnaeus 1758 oyster
 Carditida - Crassatellidae
Crassatella sulcata Solander 1866 clam
 Carditida - Carditidae
 Pholadida - Corbulidae
"Corbula globosa" = Varicorbula globosa Sowerby 1818 clam
 Cardiida - Veneridae
? Venus sp. Linnaeus 1758 venus clam
 Cardiida - Psammobiidae
 Nuculida - Nuculidae
"Nucula similis" = Nucula (Pronucula) similis
"Nucula similis" = Nucula (Pronucula) similis Cossmann and Pissarro 1904 nut clam
 Neogastropoda - Olividae
"Ancillaria canalifera" = Ancilla
"Ancillaria canalifera" = Ancilla olive snail
 Neogastropoda - Buccinidae
 Neogastropoda - Melongenidae
"Fusus bulbiformis" = Sycostoma bulbiforme
"Fusus bulbiformis" = Sycostoma bulbiforme Lamarck 1803 snail
 Neogastropoda - Cancellariidae
 Neogastropoda - Volutidae
"Voluta luctator" = Athleta (Volutospina) luctator, "Voluta spinosa" = Athleta (Volutospina) spinosa, "Voluta lima" = Volutocorbis lima
"Voluta luctator" = Athleta (Volutospina) luctator Sowerby 1823 volute
"Voluta spinosa" = Athleta (Volutospina) spinosa Linnaeus 1758 volute
"Voluta lima" = Volutocorbis lima Sowerby 1823 volute
 Neogastropoda - Muricidae
"Murex tricarinatus" = Pterynotus (Pterynotus) crenulatus tricarinatus Lamarck 1803 mustached bat
 Neogastropoda - Turridae
"Pleurotoma prisca" = Turris, "Pleurotoma macilenta" = Turris, "Pleurotoma exorta" = Turris
"Pleurotoma prisca" = Turris turrid
"Pleurotoma macilenta" = Turris turrid
"Pleurotoma exorta" = Turris turrid
 Neogastropoda - Conidae
"Conus dormitor" = Conorbis dormitor
"Conus dormitor" = Conorbis dormitor Solander 1766 cone shell
 Stromboidea - Strombidae
"Fusus errans" = Rostellaria (Fusus), Fusus longaevus, "Rostellaria rimosa" = Rimella rimosa
"Fusus errans" = Rostellaria (Fusus) true conch
Fusus longaevus Solander 1766 true conch
"Rostellaria rimosa" = Rimella rimosa Solander 1766 true conch
 Naticoidea - Naticidae
Ampullaria acuta Lamarck 1804 moon snail
Ampullaria patula Lamarck 1804 moon snail
 Sorbeoconcha - Turritellidae
"Turritella conoidea" = Haustator conoidea
"Turritella conoidea" = Haustator conoidea Sowerby 1814 turret shell
 Dentaliida - Dentaliidae
 Spatangoida - Spatangidae
Spatangus sp. Gray 1825 heart urchin
Anthozoa indet.1 Ehrenberg 1834
Plantae indet. Haeckel 1866