Report On the Geological Survey of the State of Iowa Embracing the Results of
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Geological formation and localities. In the Keokuk and Warsaw lime- stones : Keokuk, Iowa ; Warsaw, and Dallas, Illinois.
PALEONTOLOGY OF IOWA. 663 Spirifer subequalis ( n. S. ).
PLATE XXIII. FIG. 9 a, b, c.
SHELL semielliptical, about twice as wide as long : valves almost entirely equal, the beak of the ventral valve being very slightly elevated above the opposite. Dorsal valve depressed convex ; the mesial fold obtusely angular, scarcely defined at its margins : a na...rrow cardinal area, which is conspicuous in well preserved specimens. Ventral valve somewhat gibbous on the umbo : beak slightly incurved : mesial sinus not observable on the upper half of the shell, and becoming a broad depression with undefined margins below : area of moderate width, extending to the cardinal extremi- ties ; foramen large, the width at base greater than the length of the side.
Entire surface, including sinus and fold, marked by sim- ple rounded plications, which bifurcate near the beak, and of which there are about eighteen on each side, and about eight on the mesial fold and ten in the sinus ; concentrically marked by undulating laminae of growth and finer stride.
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To quickly assess the difficulty of the text, read a short excerpt:
Profile view of the same.
Geological formation and localities. In the Keokuk and Warsaw lime- stones : Keokuk, Iowa ; Warsaw, and Dallas, Illinois.
PALEONTOLOGY OF IOWA. 663 Spirifer subequalis ( n. S. ).
PLATE XXIII. FIG. 9 a, b, c.
SHELL semielliptical, about twice as wide as long : valves almost entirely equal, the beak of the ventral valve being very slightly elevated above the opposite. Dorsal valve depressed convex ; the mesial fold obtusely angular, scarcely defined at its margins : a na...rrow cardinal area, which is conspicuous in well preserved specimens. Ventral valve somewhat gibbous on the umbo : beak slightly incurved : mesial sinus not observable on the upper half of the shell, and becoming a broad depression with undefined margins below : area of moderate width, extending to the cardinal extremi- ties ; foramen large, the width at base greater than the length of the side.
Entire surface, including sinus and fold, marked by sim- ple rounded plications, which bifurcate near the beak, and of which there are about eighteen on each side, and about eight on the mesial fold and ten in the sinus ; concentrically marked by undulating laminae of growth and finer stride.
What to read after Report On the Geological Survey of the State of Iowa Embracing the Results of?
You can find similar books in the "Read Also" column, or choose other free books by Iowa Geological Survey to read onlineMoreLess
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