U.S. Geological Survey Professional Paper, Issue 142U.S. Government Printing Office, 1947 - Geology |
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Page 8
... lunule ; the escutcheon iş elongate - cordate , ill - defined , the margins in the middle line slightly pouting ; internally polished , hardly pearly , with the basal margin finely sharply crenulate ; the chondro- phore small , narrow ...
... lunule ; the escutcheon iş elongate - cordate , ill - defined , the margins in the middle line slightly pouting ; internally polished , hardly pearly , with the basal margin finely sharply crenulate ; the chondro- phore small , narrow ...
Page 9
... Lunule not sharply delimited , indicated by the flattening of the shell . Escutcheon narrow , elongate , cordate , flattened but not depressed . A subcutaneous radial sculpture developed , usually obsolete in the umbonal region but fine ...
... Lunule not sharply delimited , indicated by the flattening of the shell . Escutcheon narrow , elongate , cordate , flattened but not depressed . A subcutaneous radial sculpture developed , usually obsolete in the umbonal region but fine ...
Page 10
... Lunule not defined , indicated by the flattening of the valves over a lenticular area , a slight darkening of the shell , and the closer radials . Escutcheon obscurely defined , cordate , flattened but not sunken , the shell substance ...
... Lunule not defined , indicated by the flattening of the valves over a lenticular area , a slight darkening of the shell , and the closer radials . Escutcheon obscurely defined , cordate , flattened but not sunken , the shell substance ...
Page 11
... lunule , escutcheon , dentition , and muscle and mantle scars - vary but little . The Shoal River forms as a rule are larger than those from the Chipola and , on the whole , the more coarsely sculptured forms are more heavily built ...
... lunule , escutcheon , dentition , and muscle and mantle scars - vary but little . The Shoal River forms as a rule are larger than those from the Chipola and , on the whole , the more coarsely sculptured forms are more heavily built ...
Page 12
... lunule , bent abruptly outward and slightly downward at the keel , slightly flexuous across the keel , disappearing abruptly at the edge of the escutcheon ; interspaces decidedly wider than the laminae upon the rostrum , not so wide ...
... lunule , bent abruptly outward and slightly downward at the keel , slightly flexuous across the keel , disappearing abruptly at the edge of the escutcheon ; interspaces decidedly wider than the laminae upon the rostrum , not so wide ...
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Common terms and phrases
acute adult altitude angulated anteriorly Apertural view arcuate axial sculpture Baileys Ferry base body whorl Calhoun County canal cardinal Chipola formation Chipola River chipolana conch Conrad constricted costals Dall denticles Dimensions dorsal margin elevated fauna feebly FIGURE flattened front Gardner genus grooves height hinge holotype incremental Inner margin labrum later whorls latitude left valve less Liberty County ligament lirae lirate lunule Maury maximum diameter mile below Baileys millimeters Miocene moderately narrow Oak Grove Oak Grove sand obliquely obscure obtuse Occurrence Okaloosa County Outer lip outline pallial line paratype penult periphery pillar Plate posterior fasciole posterior margin posteriorly prominent protoconch radial ribs right valve sharply Shell Bluff Shell small Shoal River formation sinus slender slightly smooth specimens spiral sculpture spire striated subsp suture Trans Type locality U. S. Nat umbones valve cotype varix view of holotype volutions Wagner Free Inst Walton County