Chwarel Bryn Banc (Bryn Bank Quarry)
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Geology & landscape
Mining / Industrial: Quarry
Description
Description This disused quarry, situated about 2 miles east of Narberth, exposes a 70m succession of fossiliferous limestones originally believed to belong to the lower Llandeilo Series. However, recent research has shown that, on the basis of the shelly faunas, the limestones are partly of upper Llandeilo and partly of basal Caradoc age. The quarry has yielded a marrolithinid trilobite fauna distinctly different from any fauna known from the Llandeilo beds of Llandeilo but resembling, in part, a fauna from the Spy Wood Grit of Shropshire. The fauna recorded from the site includes Brongniartella,Flexicalymene, Decoroproetus, Glyptorthis and Dalmanella, but is not truly diagnostic. The detailed trilobite succession which can be studied in this quarry is useful in determining the 'way up' of the strata, and can thus be used to help interpret the structure of the area. A site with great potential for studying the Llandeilo-Caradoc Series boundary.