. Bulletins of American paleontology. he Playa Biofacies. A. /,)/viii, the key had a rocky rather than a muddy shore. Rarespecimens of Tectaiiiis were found eksewhere, but Lit-toriiui and Nerita were not. DISTRIBUTION: All of the keys inside Florida Bayhave muddy shores, so this biofacies is found only onthe Atlantic side of the rock keys from Key Largosouthward, wherever wave action has exposed bed-rock. ENVIRONMENTAL FACTORS We mentioned in discussing the transition betweenthe Central Interior and Exterior Biofacies that Tran-seimelUi conradina and Brachidontes exitstiis vary innumbers with
. Bulletins of American paleontology. he Playa Biofacies. A. /,)/viii, the key had a rocky rather than a muddy shore. Rarespecimens of Tectaiiiis were found eksewhere, but Lit-toriiui and Nerita were not. DISTRIBUTION: All of the keys inside Florida Bayhave muddy shores, so this biofacies is found only onthe Atlantic side of the rock keys from Key Largosouthward, wherever wave action has exposed bed-rock. ENVIRONMENTAL FACTORS We mentioned in discussing the transition betweenthe Central Interior and Exterior Biofacies that Tran-seimelUi conradina and Brachidontes exitstiis vary innumbers with the depth of water. We also noted a sim-ilar depth effect separating Anomalocardia and Par-astarte in the Northern Biofacies. Relationships likethis led us to collect data on: (I) depth of water, (2)mud content of the sediments and (?) salinity of sur-face water. Depth of Water WATER DEPTH AND INDIVIDUAL TAXA: Text-figures 26-28 show the changes in the numbersof TransennelUi conrcidiiui. Brachidontes exiistiis andParviliicinti miilil
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