Reports, Volume 5 |
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Page 19
... ridges , separated by at first very shallow then gradually deepening and widening furrows . At a point about midway between the summit and base where the rays become free , they are actually elliptical in transverse section , four or ...
... ridges , separated by at first very shallow then gradually deepening and widening furrows . At a point about midway between the summit and base where the rays become free , they are actually elliptical in transverse section , four or ...
Page 20
... ridges , so as to enclose large but rather shallow concave spaces or cups , varying , so far as observed , in length from 20 to 30 mm . , and in width from 12 to 32 mm . The surface of the cups slopes gradually up to the base of the ...
... ridges , so as to enclose large but rather shallow concave spaces or cups , varying , so far as observed , in length from 20 to 30 mm . , and in width from 12 to 32 mm . The surface of the cups slopes gradually up to the base of the ...
Page 21
Missouri. Bureau of Geology and Mines. The ridges on one side of the expansion correspond to the central depression on the other . Zoccia apertures very slightly oblique , subcircular or oval , 0.15 to 0.20 mm . in diam- eter , arranged ...
Missouri. Bureau of Geology and Mines. The ridges on one side of the expansion correspond to the central depression on the other . Zoccia apertures very slightly oblique , subcircular or oval , 0.15 to 0.20 mm . in diam- eter , arranged ...
Page 40
... ventral valve very long and arched , the hinge line short ; surface marked by broad rounded radiat- ing ridges , which are crossed by fine concentric lines . Horizon and localities -Lower Carboniferous , Kinder- hook beds : 40 BRACHIOPODS .
... ventral valve very long and arched , the hinge line short ; surface marked by broad rounded radiat- ing ridges , which are crossed by fine concentric lines . Horizon and localities -Lower Carboniferous , Kinder- hook beds : 40 BRACHIOPODS .
Page 42
... ridge corresponding to the sinus of the other valve . Interior with a rugose ridge extending around near the front and lateral margins , so as to present a somewhat geniculated appearance , not seen on the outside ; cardinal pro- cess ...
... ridge corresponding to the sinus of the other valve . Interior with a rugose ridge extending around near the front and lateral margins , so as to present a somewhat geniculated appearance , not seen on the outside ; cardinal pro- cess ...
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Common terms and phrases
13th Ann Actinocrinus Allorisma aperture Athyris Aviculopecten Batocrinus beak Bellerophon Burlington limestone Capulus carbonaria cardinal Chonetes Conularia convex Cooper county costæ crinoid Dorsal valve Dyas in Nebraska Edmondia Fenestella figs flattened gasteropod Geinitz genus Geology Iowa Hall Henry county hinge-line Horizon and localities Horizon and localities.-Lower Horizon and localities.-Upper Illinois incurved Indiana John & Worthen Kansas City Kaskaskia Kaskaskia limestone Keokuk limestone Kinderhook lines of growth localities.-Lower Carboniferous localities.-Upper Carboniferous Louis Acad Lower Carboniferous Macrochilus margin McChesney Meek & Worthen mesial Missouri missouriensis Myalina Naticopsis Nautilus Nebraska Norwood & Pratten occidentalis Orthis Orthoceras Phila Plate Platyceras Platycrinus Pleurotomaria Polypora posterior Proc Productus prominent radiating Rhynchonella ridge rounded Saint Louis limestone Shumard Silurian sinus Soleniscus species specimens Sphærodoma spire Spirifer Spirifera Straparollus striæ Strophomena Surface marked Swallow Terebratula Trans U. S. Geol Ulrich Upper Coal Measures Ventral valve VIII volutions whorls