Fauna of the Martinez Eocene of California
Fauna of the Martinez Eocene of California
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In our eReader you can find the full English version of the book. Read Fauna of the Martinez Eocene of California Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Fauna of the Martinez Eocene of California
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8 equal to about one-third the height of the shell; anterior extremity slightly attenuated, evenly rounded; base broadly rounded; posterior evenly rounded, curving gently in the dorsal region to the beak ; sur- face roughened by coarse lines of growth; hinge and interior but imperfectly known.
Dimensions. Length, 32 mm. ; height, 26 mm. ; diameter of one valve, 5mm.
Horizon. Lower Martinez, Meretrix dalli zone.
This form varies considerably from the type specimen to an elon- gated form, which i...s slightly more ventricose. Gradational types are found between these forms.
Type from University of California Locality 1556.
MARTESIA(?), sp.
Shell elongate with thin test; beaks anterior, incurved, approxi- mate ; posterior dorsal margin concave and undulating ; anterior dorsal margin short, rounded; anterior end rounded; posterior end slightly flaring; ventral margin nearly straight. One beaded umbonal groove diverges from the beak. A posterior groove, which indicates the position of an internal rib, makes a very obtuse angle with the ventral margin.
What to read after Fauna of the Martinez Eocene of California?
You can find similar books in the "Read Also" column, or choose other free books by Roy E Roy Ernest Dickerson to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
8 equal to about one-third the height of the shell; anterior extremity slightly attenuated, evenly rounded; base broadly rounded; posterior evenly rounded, curving gently in the dorsal region to the beak ; sur- face roughened by coarse lines of growth; hinge and interior but imperfectly known.
Dimensions. Length, 32 mm. ; height, 26 mm. ; diameter of one valve, 5mm.
Horizon. Lower Martinez, Meretrix dalli zone.
This form varies considerably from the type specimen to an elon- gated form, which i...s slightly more ventricose. Gradational types are found between these forms.
Type from University of California Locality 1556.
MARTESIA(?), sp.
Shell elongate with thin test; beaks anterior, incurved, approxi- mate ; posterior dorsal margin concave and undulating ; anterior dorsal margin short, rounded; anterior end rounded; posterior end slightly flaring; ventral margin nearly straight. One beaded umbonal groove diverges from the beak. A posterior groove, which indicates the position of an internal rib, makes a very obtuse angle with the ventral margin.
What to read after Fauna of the Martinez Eocene of California?
You can find similar books in the "Read Also" column, or choose other free books by Roy E Roy Ernest Dickerson to read onlineMoreLess
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