ammonites
Sunnydown Farm Quarry (clay: upper horizon; equivalent to DB 102/103 ) (Cretaceous of the United Kingdom)

Also known as Langton Matravers

Where: England, United Kingdom (50.6° N, 2.0° W: paleocoordinates 41.5° N, 7.9° E)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Cherty Freshwater Member (Lulworth Formation), Middle Berriasian (145.5 - 140.2 Ma)

• Uppermost Lulworth Beds of Casey 1963, lying just below the Cinder Member, the base of which currently marks the Jr/K boundary in Southern England. Section originally published by Ensom 1985. Correlated with horizon DB102 in Durlston Bay.

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•Ensom & Sigogneau-Russell (1998, p. 35): The upper horizon lies at the junction of a clay, locally termed the 'Sly', which immediately underlies the 'Cap' bed, 2.6 m below the base of the Cinder Member. This clay-limestone interface can be equated confidently with beds DB 102/103 in Durlston Bay (CLements 1993).

• bed-level stratigraphic resolution

Environment/lithology: lacustrine - small; cherty/siliceous limestone and argillaceous, calcareous claystone

• Conditions of deposition generally brackish or freshwater, though there are occasional appearances of almost normal marine fauna. Clays may represent mud flats bordering a freshwater lake.

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•Ensom & Sigogneau-Russell (1998, p. 35): The sedimentology and environmental setting of the upper horizon has been described by West (1988). Both horizons are thought to represent clays bordering shallow freshwater lakes

• A sequence of thin limestones, micrites, argillaceous micrites, calcareous shales and clays. The limestones often contain nodules of chert.

Size classes: macrofossils, mesofossils

Collection methods: bulk, quarrying, sieve,

• 3 tons of clay dug from the floor of the quarry, normally the top 2-4cm were collected.

Primary reference: P. C. Ensom. 1987. A remarkable new vertebrate site in the Purbeck Limestone Formation on the Isle of Purbeck. Proceedings of the Dorset Natural History and Archaeological Society 108:205-206 [J. Alroy/E. Leckey/E. Leckey] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 28401: authorized by John Alroy, entered by Erin Leckey on 12.02.2003, edited by Matt Carrano, Roger Benson, Richard Butler, John Alroy and Philip Mannion

Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)