242 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 30 Ser. 



any species which was not present in the richer sample 

 received afterwards. 



The second samples bear the label " from a well in Santa 

 Clara Co." The rock is a grey-brown marl, somewhat 

 paler than the first specimen, rather shaley, and crowded 

 with Foraminifera, which appear as minute white specks 

 disseminated through it. 



The matrix of the foraminiferal marl when seen in a thin 

 section is of a rich brown color, and appears to be derived 

 from the decomposition of basaltic or palagonitic material. 



From the fact that the foraminiferal shells have their 

 chambers, in nearly all cases, quite empty, it seems reason- 

 able to conclude that the enveloping mud was quickly hard- 

 ened around the organisms; thus leaving the shells without 

 an infilling, which is so usual elsewhere in the case of 

 Foraminifera of these particular genera. 



In making a comparison of the various foraminiferal 

 faunas, we find that this of the Californian Tertiary has its 

 nearest analogue in the beds of Monte Bartolomeo on the 

 Lago di Garda, Italy, the Foraminifera of which were so 

 well described and figured by Dr. Egger in 1895,' and 

 classed as Older Pliocene. The Foraminifera of the two 

 deposits are strikingly similar, with the chief difference 

 that the Californian marl is not quite so rich in species. 



Another noteworthy assemblage, containing a large pro- 

 portion of the Californian species, is that of the tertiaries of 

 the Vienna Basin, probably of Miocene age.^ 



The Miocene of America, so far as the beds have yet 

 been examined for Foraminifera, does not yield a very large 

 proportion of species in common with this present deposit, 

 but bears a general resemblance to it. The Miocene beds 

 of the States of New Jersey, Alabama, Virginia and 

 Maryland have been examined for Foraminifera by Drs. A. 

 Woodward^ and R. M. Bagg.* 



1 " Fossile Foraminiferen von Monte Bartolomeo am Gardasee," Jahresbericht XVI, 

 des Naturhistorischen Vereins Passau, 1S95. 



^d'Orbiguy, 1846, " Foraminiferes fossiles du Bassin tertiare de Vienne." Paris. 



^"Note on the F'oraminiferal Fauna of Miocene Beds at Petersburg, Virginia." 

 Joitrn. N. York Microscopical Soc, Vol. Ill, 18S7, pp. 16, 17. Also " Foraminifera found in 

 the Borings from Artesian Wells located iu New Jersey and Alabama." Journ. N. York 

 Micr. .Soc, Jan., 1898, pp. 1-3. 



4" The Tertiary and Pleistocene Foratninifera of the Middle Atlantic Slope." Bull. 

 Anur. PaliBont., Vol. II, No. 10, 1898. 



