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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)


Journal of Sedimentary Petrology
Vol. 51 (1981)No. 2. (June), Pages 479-489

Algal Aragonite-encrusted Pisoids from a Lower Carboniferous Schizohaline Lagoon

V. P. Wright


Pisoids from the Lower Carboniferous Llanelly Formation of South Wales contain both algal and fascicular-optic calcite laminae. The latter are here interpreted as a replacement product of aragonite and display characteristic calcitization textures. The original aragonite laminae formed in a hypersaline setting and are compared with Recent coniatoid deposits. The pisoids also show evidence of having grown periodically in a near normal marine setting as well as showing evidence of early solution probably by meteoric waters. The pisoids grew in a schizohaline lagoon formed as the initial phase of a marine incursion, during a period of fluctuating peritidal and arid floodplain deposition. The schizohalinity resulted from seasonal effects in a climate with a marked dry season.

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