. Bulletins of American paleontology. for everyfour square miles ( km-). Obviously, the resultingmaps are very much generalized. An example will make it clearer how little we yetknow of the true boundaries of these biofacies. OnMay 23. 1966, we stopped in the channel betweenWindley and Upper Matecumbe Keys (Whale Harbor).As an experiment we dredged a sample from the bot-tom of the channel over the stern of our boat. Thenwe dug a shovel sample from the mud bank at the bowof the boat. The channel proved to have a Tricoliafauna, while the bank, just a boats length away, yield-ed a Central Exte
. Bulletins of American paleontology. for everyfour square miles ( km-). Obviously, the resultingmaps are very much generalized. An example will make it clearer how little we yetknow of the true boundaries of these biofacies. OnMay 23. 1966, we stopped in the channel betweenWindley and Upper Matecumbe Keys (Whale Harbor).As an experiment we dredged a sample from the bot-tom of the channel over the stern of our boat. Thenwe dug a shovel sample from the mud bank at the bowof the boat. The channel proved to have a Tricoliafauna, while the bank, just a boats length away, yield-ed a Central Exterior fauna. It seems inevitable thatmore closely-spaced sampling almost anywhere in theBay will yield much more complex patterns than ourmaps show. THE MARINE BIOFACIES Northern BiofaciesKEY TAXA: The Northern Biofacies is dominatedby either of two clams: Anoinalocardia auberiana orthe tiny Paiastarte triquetra (Text-fig. 5A, B). Anal-ysis of all occurrences of both shells where we re-corded water depth shows that Parastarte is most. Text-figure 5.—Most important tAnoinalocardia auberiana. B. Pariiteni. D. Retusa candei. I of the Northern Biofacies. trimietra. C. Hvdrohia lol- abundant in water about 21 inches (53 cm) deep whileAnoinalocardia is more abundant in water about 42inches (ca. 107 cm) deep. The preference of Parastarte for shallower watermakes it the more commonly Dominant Taxon in thewestern half of the Northern area which is generallyfilled with mud (Text-fig. 6). East of the Black BeLsyKeys the lakes have less mud filling so the water isslightly deeper and Anoinalocardia dominates. In the shallower Parastarte subfacies Parastarte() and Anoinalocardia () together makeup of all mollusks. In Xhc Anoinalocardia subfa-cies Anoinalocardia dominates (), but Para-starte becomes a minor element (). The Parastarte and Anoinalocardia assemblages aretreated as subfacies because of the importance of An-oinalocardia in both. The shift upward fro
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