U.S. Geological Survey Professional Paper, Issue 142U.S. Government Printing Office, 1947 - Geology |
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Page 22
... base , the posterior obliquely arcuate . Anterior extremity very broadly rounded , the posterior obtusely pointed . Base line approximately horizontal . Shell obscurely rostrate behind , the angle rather well defined toward the umbones ...
... base , the posterior obliquely arcuate . Anterior extremity very broadly rounded , the posterior obtusely pointed . Base line approximately horizontal . Shell obscurely rostrate behind , the angle rather well defined toward the umbones ...
Page 31
base nearly parallel with the hinge line , posterior end some- what produced ; beaks narrow , cardinal area with from three to five sets of lozenge - shaped groovings ; hinge strong , the teeth in two adjacent series , somewhat oblique ...
base nearly parallel with the hinge line , posterior end some- what produced ; beaks narrow , cardinal area with from three to five sets of lozenge - shaped groovings ; hinge strong , the teeth in two adjacent series , somewhat oblique ...
Page 84
... base ; base line very slightly arched . Tips of umbones abruptly flattened , feebly prosogyrate . Lunule rather narrow , lenticular in out- line , slightly wider in the left valve than in the right , defined chiefly by the disappearance ...
... base ; base line very slightly arched . Tips of umbones abruptly flattened , feebly prosogyrate . Lunule rather narrow , lenticular in out- line , slightly wider in the left valve than in the right , defined chiefly by the disappearance ...
Page 125
... base . Concentric sculp- ture reduced to exceedingly fine and faint incremental striae and a few rather pronounced resting stages toward the base . Half a dozen or more radial flutings also developed , extending from the anterior and ...
... base . Concentric sculp- ture reduced to exceedingly fine and faint incremental striae and a few rather pronounced resting stages toward the base . Half a dozen or more radial flutings also developed , extending from the anterior and ...
Page 162
... base line . Shell relatively broad : Callocardia ( Agriopoma ) sincera Dall . Pitting of the external surface little or not at all marked in the adult forms . Callocardia ( Agriopoma ) prosayana Gardner , n . sp . Pitting of the ...
... base line . Shell relatively broad : Callocardia ( Agriopoma ) sincera Dall . Pitting of the external surface little or not at all marked in the adult forms . Callocardia ( Agriopoma ) prosayana Gardner , n . sp . Pitting of the ...
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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