Jurassic Chronology: II—Preliminary Studies. Certain Jurassic Strata near Eypesmouth (Dorset); the Junction-Bed of Watton Cliff and Associated Rocks
1922; Geological Society of London; Volume: 78; Issue: 1-4 Linguagem: Inglês
10.1144/gsl.jgs.1922.078.01-04.14
ISSN2058-105X
Autores Tópico(s)Geochemistry and Geologic Mapping
ResumoI. Introduction. This paper is to a certain extent a supplement to the communication on ‘Certain Jurassic Strata of South Dorset’ published by the Geological Society in 1910, in so far as it contains a study of another exposure of the Junction-Bed (Domerian, Whitbian, Yeovilian) 1 discovered farther east along the coast; but it also gives a sketch of other Jurassic strata, the sequence of which should be of some importance in connexion with the chronology of the Oolite rocks. About three-quarters of a mile east of Thorncombe Beacon is Eypesmouth, a break in the cliffs where the little stream, the Eype (pronounced ‘Eep,’ to rhyme with sheep) runs into the sea. East of Eypesmouth is a lofty cliff of about a mile extending to West Bay—the harbour of Bridport. The cliff is interesting geologically for three considerable faults: one, seen best about a quarter of a mile east of Eypesmouth is a fault of about 500 feet, bringing down Forest-Marble Beds to about the level of Yeovilian strata ( Dumortieria hemera); another, about the same distance west of West Bay, brings down beds of Fullers' Earth almost vertically—it is a fault of about 120 feet; the third, immediately west of West Bay, shows Yeovilian strata of Dumortieria hemera or later—they are later than those on the west of the cliff—lying level with lower beds of Fuller's Earth: a drop as regards the latter of about 150 feet. So the middle and main portion of the cliff is let down by these
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