U.S. Geological Survey Professional Paper, Issue 142U.S. Government Printing Office, 1947 - Geology |
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Page 12
... grooves , approximately uniform from the umbones to the ventral margin , slightly more compressed anteriorly , and not persistent across the rostrum . The normal sculpture of Leda acuta is a little more elevated and sharper , and there ...
... grooves , approximately uniform from the umbones to the ventral margin , slightly more compressed anteriorly , and not persistent across the rostrum . The normal sculpture of Leda acuta is a little more elevated and sharper , and there ...
Page 22
... grooves . Margins smooth or crenulate . Pallial line simple . Adductor impressions subequal , strongly marked . A genus represented by about 500 fossil species , which range from the Silurian onward , and by about 150 recent species ...
... grooves . Margins smooth or crenulate . Pallial line simple . Adductor impressions subequal , strongly marked . A genus represented by about 500 fossil species , which range from the Silurian onward , and by about 150 recent species ...
Page 23
... groove ..... Diluvarca dodona ( Dall ) . Radials simple , not mesially sulcate . Diluvarca strebla Gardner , n ... grooves . The hinge line is straight ; the teeth are numerous , subequal , and approximately at right angles to the ...
... groove ..... Diluvarca dodona ( Dall ) . Radials simple , not mesially sulcate . Diluvarca strebla Gardner , n ... grooves . The hinge line is straight ; the teeth are numerous , subequal , and approximately at right angles to the ...
Page 25
... grooves to the number of half a dozen are developed near the hinge line . The hinge is very finely serrate within ... grooves forming a small triangle , within which are traces of the inception of other grooves ; sculpture chiefly ...
... grooves to the number of half a dozen are developed near the hinge line . The hinge is very finely serrate within ... grooves forming a small triangle , within which are traces of the inception of other grooves ; sculpture chiefly ...
Page 26
... grooves . The hinge is extremely narrow and finely serrate medially but widens distally , especially behind the umbones . There are about four relatively coarse anterior teeth and half a dozen posterior . The inner margins are simple ...
... grooves . The hinge is extremely narrow and finely serrate medially but widens distally , especially behind the umbones . There are about four relatively coarse anterior teeth and half a dozen posterior . The inner margins are simple ...
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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