Probable algal fossil remains are identifiable in quartz-albite-biotite-chlorite-facies dolomitic marbles in the Lower Cambrian Shady Formation adjacent to the Alabama Piedmont. Organic origins were interpreted from distinctive recrystallization microfabrics and the sedimentologically controlled assemblage talc-apatite-pyrite. Thrombolite and cryptalgal stromatolitic growth forms are most common, and along with other data define a peritidal environmental complex containing mostly biogenic carbonate sediment. This complex evolved from intertidal to subtidal conditions during Shady time.

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