. Bulletins of American paleontology. ext-fig. 12D), Chione intapurpurea () (Text-fig. I2E). Vcrmicularia spirata ()(Text-fig. 12F). Mocluhis iiuhIiiIus (^). Bulla striata(), Transennella stimpsoni (), and AcinaeaantiUanun () (Text-fig. 12G). The tiny operculaof Tricolia (Text-fig. 53H) make up of the fauna. KEY TAXA: Bulla and Modulus can be ignored,along with Caecum nitidum so that the usable fieldtaxa become Cerithiuin atratuin. Mercenaria. Tricolia,Vermicularia. Chione intapurpurea. Transennellastimpsoni and Acmaea. This is a distinctive group oftaxa. BIOFACIES
. Bulletins of American paleontology. ext-fig. 12D), Chione intapurpurea () (Text-fig. I2E). Vcrmicularia spirata ()(Text-fig. 12F). Mocluhis iiuhIiiIus (^). Bulla striata(), Transennella stimpsoni (), and AcinaeaantiUanun () (Text-fig. 12G). The tiny operculaof Tricolia (Text-fig. 53H) make up of the fauna. KEY TAXA: Bulla and Modulus can be ignored,along with Caecum nitidum so that the usable fieldtaxa become Cerithiuin atratuin. Mercenaria. Tricolia,Vermicularia. Chione intapurpurea. Transennellastimpsoni and Acmaea. This is a distinctive group oftaxa. BIOFACIES STRUCTURE: Like all of the biofa-cies, this is right-skewed (Table 3) although not sostrongly as some others. Of the 248 taxa found in typ-ical Cerithiuin samples, the ten listed taxa make uphalf of the fauna while there are 100 taxa in the rarest1%. The remaining 138 taxa comprise the intervening49%. DISTRIBUTION: The Cerithiuin Biofacies devel-ops in the more open-water areas of the southwestern MoLLUSK Shells in Florida Bay: Shaw. Bay (Text-fig. 13), lying mainly opposite the gaps be-tween the keys southwest of Lower Matecumbe patches also lie opposite the gap between thetwo Matecumbe Keys and between Plantation Key andKey Largo. North of Plantation Key there is a wid-ening band of the biofacies that borders the Atlanticside of the rock keys as far as we carried our sampling. The Ceiithiiim fauna appears to form a sort of bufferzone between the Tricolia Biofacies and the more re-stricted Central faunas, and it could be that more de-tailed sampling and mapping will show it more wide-spread in this position than is here documented. TRANSITION FROM THE CENTRAL EXTERI-OR BIOFACIES: If we look only at the Dominant andKey Taxa, the shift from the Central Interior to theCerithium Biofacies is much more abrupt than that be-tween the Biofacies discussed earlier, but, viewed as awhole, the taxa of the two assemblages are largely thesame. The 19 typical (non-transitional)
Size: 1939px × 1289px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidbulletinsofa, bookyear1895
