"Silurian period" Quotes from Famous Books
 ... altogether extinct, a single specimen having been discovered about ten years ago in the West Indies. Even Pictet, in the second edition of his Paleontology, still considers Pleurotomaria as extinct, and as belonging to the fossiliferous formations which extend from the Silurian period to the Tertiary. Of the living species found at Marie Galante, nothing is known except the specific characteristics of the shell. We dredged it in one hundred and twenty fathoms, on the west side of Barbados, alive, ...
— Louis Agassiz: His Life and Correspondence • Louis Agassiz |
