Report on the United States and Mexican Boundary Survey: Made Under the Direction of the Secretary of the Interior, 1권,파트 2C. Wendell, printer, 1857 |
도서 본문에서
15개의 결과 중 1 - 5개
148 페이지
... ribs about 34 , narrow , prominent , compressed , or laterally abrupt , nodulose , diverging near the dorsal margin ; ribs posteriorly , about the umbonal slope , composed of series of small nodules . The form of this species approaches ...
... ribs about 34 , narrow , prominent , compressed , or laterally abrupt , nodulose , diverging near the dorsal margin ; ribs posteriorly , about the umbonal slope , composed of series of small nodules . The form of this species approaches ...
149 페이지
... ribs radiating , probably about twenty - five in number . An abundant species in the form of casts of entire specimens . A mere trace of the shell in one of these leads to the inference that the ribs were carinated . It has some general ...
... ribs radiating , probably about twenty - five in number . An abundant species in the form of casts of entire specimens . A mere trace of the shell in one of these leads to the inference that the ribs were carinated . It has some general ...
150 페이지
... ribs 16 , prominent , rounded ? Those on the anterior slope angular , acute , umbo narrow , beaks pointed and elevated . There is one specimen of this - a cast of both valves ; there appear to be traces of radiating lines between the ribs ...
... ribs 16 , prominent , rounded ? Those on the anterior slope angular , acute , umbo narrow , beaks pointed and elevated . There is one specimen of this - a cast of both valves ; there appear to be traces of radiating lines between the ribs ...
151 페이지
... ribs , which latter have on each side a raised line or fine rib , giving it a trifid character ; upper valve subconcave . This species differs from P. quadricostatus , Sowerby , in having but two equal ribs between the larger , while ...
... ribs , which latter have on each side a raised line or fine rib , giving it a trifid character ; upper valve subconcave . This species differs from P. quadricostatus , Sowerby , in having but two equal ribs between the larger , while ...
152 페이지
... ribs ; intervening spaces concave ; concentric lines coarse , but not very prominent . Locality . - Turkey creek , Leon and Eagle Pass roads . ASTARTE , Sowerby . ASTARTE TEXANA . PLATE V , FIG . 9 . Triangular , convex - depressed ...
... ribs ; intervening spaces concave ; concentric lines coarse , but not very prominent . Locality . - Turkey creek , Leon and Eagle Pass roads . ASTARTE , Sowerby . ASTARTE TEXANA . PLATE V , FIG . 9 . Triangular , convex - depressed ...
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adjoining alluvial Ammonites basin beds belt bluffs Boundary Survey breccia calcareous cañon Caprina carbonate carboniferous limestone character clay coal measures coast collections color Colorado compact composed connexion containing copper Cordilleras course creek cretaceous cretaceous formation cretaceous fossils cretaceous strata crystalline deposits desert diluvial Eagle Pass El Paso elevation exhibit Exogyra exposures extensive feet feldspar feldspathic fossils Frémont frequently geological granite gravelly table-land green sand igneous rocks Inoceramus irregular Jersey lava lignite localities lower valve marked marl mass metamorphic rocks miles mineral Missouri mountain range mouth Nebraska numerous occur Ostrea Paso Pitcheri plain PLATE porphyritic portion present problematicus quartz region ribs ridge Rio Bravo river rocky Roemer San Pedro sandstone Santa shell side Sierra similar slope Sonoyta southwest species specimens springs strata stratified stream summit surface Tertiary formation TEXANA Texas texture thick umbo upper valley various vicinity volcanic