PROOFS OF TRANSITION FROM MARINE TO BRACKISH WATER. 303 
served by this author at Sevastopol, the convent of St. George, Simpheropol, 
Kertch and Enikald) must not, we contend, be placed on the same parallel as 
the remains which occupy a portion of the cliffs of Taman and of Kam.usc i 
Bunin in which one of us found the twenty species of peculiar Cardiacese betoie 
alluded to', mixed up with Mytili of brackish water forms, and with Lirnnem 
Paludinte and the Neritina Danubialis. Seeing that in the western and central 
portions of the vast area of Southern Russia which are covered by oceanic miocene 
deposits, there is nowhere such a predominance of brackish and freshwater over 
marine shells, we must consider the beds of Kamiuseh Burun to be more naturally 
linked on to the Aralo-Caspian or steppe limestone than to miocene deposits. 
Throughout the cliffs of Taman we observed nothing but remains similar to those 
of Kamiuseh Burun, i.e. the Cardiacem of the steppe, with Mytili and freshwater 
univalves. At the same time we believe, that to the east of Kertch, lower strata 
have been brought to the surface, particularly in a tract which has undergone 
considerable movement along the line of eruption of the adjacent mud volca- 
noes. The very few shells and corals imbedded in compact limestone, which 
we collected at Enikale, for example, are marine ; and in our specimens from 
thence there is no sign of mixture of miocene with Aralo-Caspian shells But 
admitting that the herbivorous cetacean found at Ak Burun occurred in beds of 
this a-e with marine shells, why are we not to look upon them as inferior to e 
brackish water accumulations of Kamiuseh Burun, and if so, what is there in such 
collocation to interfere with our general views? Such facts indicate nothing more 
than a passage from one formation to another, and our inference is even sustained 
by referring to M. Hoot himself , for in speaking of his middle ternary grou h 
admits that, in one part, its upper bets contain Troehns Phasmndta anff other 
marine erenera difficult to determine, mixed up with land and f re 
Naturanonfacit saltum, said our forefathers, and iri tniCtS Wl ^^ \^ C S t nLTahy 
i 1 nhan-e from purely oceanic to brackish water deposits, spots must natura y 
^l^eUnces of the transition from one set of conditions i to 
“r a glance at the M^r. to — 
^atougM tob”e^ '"or ; since they not only lie rewards the western limits 
and in which all the tertiary strata, trom ttie lovesu 
_ l ;;; n 47-58 M. Knot and his associate M. Rousseau 
1 De Verneuil, Trans Soc. Geol. de France, vol. m. p. 47 5S. 
have since augmented the number of these Cardiacese to twenty -seven. 2 It 2 
