U.S. Geological Survey Professional Paper, Issue 142U.S. Government Printing Office, 1947 - Geology |
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Page 15
... acute toward the extremity , emphasized slightly by the obscure depression in front of it . Anterior ray quite distinct on the pol- ished surface . External surface lustrous , sculptured only by a feeble corrugation in the umbonal ...
... acute toward the extremity , emphasized slightly by the obscure depression in front of it . Anterior ray quite distinct on the pol- ished surface . External surface lustrous , sculptured only by a feeble corrugation in the umbonal ...
Page 16
... acute , prominently elevated in the medial portion of each series , slightly Ʌ - shaped , the apex of the angle directed toward the umbones , numbering approxi- mately 16 in the anterior series and 13 in the posterior , the larger ...
... acute , prominently elevated in the medial portion of each series , slightly Ʌ - shaped , the apex of the angle directed toward the umbones , numbering approxi- mately 16 in the anterior series and 13 in the posterior , the larger ...
Page 17
... acute , somewhat A - shaped , the angle directed toward the umbones , 10 or 11 in the posterior series , 12 or 13 in the anterior . Anterior adductor scar moderately large , irregular in outline , placed at the distal extremity of the ...
... acute , somewhat A - shaped , the angle directed toward the umbones , 10 or 11 in the posterior series , 12 or 13 in the anterior . Anterior adductor scar moderately large , irregular in outline , placed at the distal extremity of the ...
Page 19
... acute toward the umbones , obtuse toward the outer margin . External surface sculptured with very fine , usually regular , quite sharply elevated or obtusely flattened concentric ridges , numbering about 40 to 45. Rostrum smooth , the ...
... acute toward the umbones , obtuse toward the outer margin . External surface sculptured with very fine , usually regular , quite sharply elevated or obtusely flattened concentric ridges , numbering about 40 to 45. Rostrum smooth , the ...
Page 35
... acute lines , the intervals a little convex . Shell increasing in width by a slightly curved line from the apex to beyond the middle ; lateral curvatures equal ; apices separate , small , central ; intervening space with but little ...
... acute lines , the intervals a little convex . Shell increasing in width by a slightly curved line from the apex to beyond the middle ; lateral curvatures equal ; apices separate , small , central ; intervening space with but little ...
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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