112 



Bulletin 35 



2560 



Page 180 



page 115 of the "Proceedings of the Scientific Association," 

 December, 1877,) supplying the missing letters in the diagram, 

 showing that the Miocene Polycystina marls are not interbedded 

 with the Eocene beds. 



It is a little difficult to indicate without the diagram itself 

 where the missing letters ought to come, but I will try to do so. 

 Setting the diagram before one, and measuring from the line 

 marking the righthand margin of the plate along the line intend- 

 ed to indicate the surface of the ground, it is about 45 millimetres 

 to where the letter h! should have been placed. The^ should 

 have been 50 to 55 millimetres from the same starting-point or 5 

 to 10 millimetres to the left of h' , the latter coming under the 

 word "Miocene" and the^ coming under the word "Eocene." 

 Then the g under the word "Eocene," somewhat to the left of 

 the middle of the diagram, should be turned into^'. The answer 

 to Mr. Jukes-Browne's query, which I have quoted, is therefore 

 in the ammative. 



A study of so much as is known of the Sanfernando Eocene 

 inclines me to the belief that the lower beds of that formation 

 were deposited in shallow water, and that during the deposition 

 of the succeeding beds the water was gradually deepening, until 

 at the close of the Eocene period the deposits assumed an oceanic 

 character. The enormous changes in the pt^sical geography of 

 the Caribean area of which we have evidence, and upon which I 

 have touched in several of my papers, probably took place upon 

 the close of the Eocene period and extended far into or even oc- 

 cupied the whole of what we call the Miocene epoch of this area, 

 which includes not only the West Indies, but some considerable 

 portion of Central and South America. 



I have put together the foregoing notes in somewhat of a rough 

 and imperfect manner ; but I propose, should opportunity serve, 

 to draw up a more complete account of the Eocene and Miocene 

 deposits referred to, with illustrations and a more extended notice 

 of the organic remains. 



P. S. — To the list of Foraminifera from the Orbitoides beds must be ad- 

 ded Tinoporus baculatus, P. and J., that being the name of the organism 

 described by me in the 22nd volume of the Journal of the Geological 

 Society as Cisseis asterica. The list of fossils from the nodosaria beds will 

 have to be largely augmented. 



