U.S. Geological Survey Professional Paper, Issue 142U.S. Government Printing Office, 1947 - Geology |
From inside the book
Results 1-5 of 100
Page 9
... feebly convex , much more produced than the obliquely truncate posterior slope . Basal margin asymmetrically arcuate , more strongly upcurved behind than in front . Lunule not sharply delimited , indicated by the flattening of the shell ...
... feebly convex , much more produced than the obliquely truncate posterior slope . Basal margin asymmetrically arcuate , more strongly upcurved behind than in front . Lunule not sharply delimited , indicated by the flattening of the shell ...
Page 15
... feebly opisthogyrate , subcentral or slightly anterior . Lunule narrow , len- ticular , feebly depressed , indicated chiefly by the abrupt weakening of the concentric sculpture . Es- cutcheon much wider , produced to the posterior ...
... feebly opisthogyrate , subcentral or slightly anterior . Lunule narrow , len- ticular , feebly depressed , indicated chiefly by the abrupt weakening of the concentric sculpture . Es- cutcheon much wider , produced to the posterior ...
Page 16
... feebly opisthogy- rate at the tips , slightly anterior in position . Lunule very narrow , lenticular , feebly depressed , defined chiefly by the abrupt weakening of the concentric striae . Escutcheon much wider , persistent almost to ...
... feebly opisthogy- rate at the tips , slightly anterior in position . Lunule very narrow , lenticular , feebly depressed , defined chiefly by the abrupt weakening of the concentric striae . Escutcheon much wider , persistent almost to ...
Page 17
... feebly opisthogyrate . Lunule ex- tremely narrow , lenticular , ill - defined . Escutcheon quite wide , persistent almost to the extremity of the rostrum , concave between the rostrum and the dorsal margin , very finely and evenly ...
... feebly opisthogyrate . Lunule ex- tremely narrow , lenticular , ill - defined . Escutcheon quite wide , persistent almost to the extremity of the rostrum , concave between the rostrum and the dorsal margin , very finely and evenly ...
Page 18
... feebly arcuate and including 18 to 20 teeth , the posterior feebly concave and including approximately 15 teeth ; the teeth laminar , fine and crowded toward the umbones , prominently elevated in the medial portion of each series ...
... feebly arcuate and including 18 to 20 teeth , the posterior feebly concave and including approximately 15 teeth ; the teeth laminar , fine and crowded toward the umbones , prominently elevated in the medial portion of each series ...
Other editions - View all
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