Republication of Conrads Fossil Shells of the Tertiary Formations of North Amer
Republication of Conrads Fossil Shells of the Tertiary Formations of North Amer
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) Calyptrea trochiformis, (Lam. ) Pyrula tricarinata, (Lam. ) Acicula trigona, (Lam. ) Cytherea erycinoides, (Lam. ) C. Subery- cinoides, (Desh. ) Corbis lamellosa, (Lam. ) Cardita planicosta, (Blain. ) Fistulana elongata. (Desh. ) 8. A mass of Ostrea selheformis, about three feet in thickness, in sand cemented by carbonate of lime. As this oyster also oc- curs in the newer Cretaceous strata, at first I supposed the present to be of the same age . As the latter deposit, but a subsequent ex- ami...nation of the inferior stratum convinced me to the contrary, as I found it characterized by Eocene fossils exclusively. Large specimens of the Ostrea generally have a water worn appearance, and occur mostly in single valves ; the young which are vastly abundant are also disunited, but invariably uninjured and unworn. Fragments of this rock form a talus at the base of the escarpment.
4. A dark colored marl, seventy feet in thickness, in which the same Ostrea occurs, but smaller and less abundant than above.
What to read after Republication of Conrads Fossil Shells of the Tertiary Formations of North Amer?
You can find similar books in the "Read Also" column, or choose other free books by T a Timothy Abbott Conrad to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
) Calyptrea trochiformis, (Lam. ) Pyrula tricarinata, (Lam. ) Acicula trigona, (Lam. ) Cytherea erycinoides, (Lam. ) C. Subery- cinoides, (Desh. ) Corbis lamellosa, (Lam. ) Cardita planicosta, (Blain. ) Fistulana elongata. (Desh. ) 8. A mass of Ostrea selheformis, about three feet in thickness, in sand cemented by carbonate of lime. As this oyster also oc- curs in the newer Cretaceous strata, at first I supposed the present to be of the same age . As the latter deposit, but a subsequent ex- ami...nation of the inferior stratum convinced me to the contrary, as I found it characterized by Eocene fossils exclusively. Large specimens of the Ostrea generally have a water worn appearance, and occur mostly in single valves ; the young which are vastly abundant are also disunited, but invariably uninjured and unworn. Fragments of this rock form a talus at the base of the escarpment.
4. A dark colored marl, seventy feet in thickness, in which the same Ostrea occurs, but smaller and less abundant than above.
What to read after Republication of Conrads Fossil Shells of the Tertiary Formations of North Amer?
You can find similar books in the "Read Also" column, or choose other free books by T a Timothy Abbott Conrad to read onlineMoreLess
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