Personal (Otd Seletitilic Xe^rs. 139 
Israel C. Rtssell — A geological reconnoissance in the eenlral 
part of the state of Washington. (Read by title. ) 
R. W. Ells — -The importance of photography in ilhistrating 
geological structure. 
Tlie latter was a verbal description ol' a series of large colored pho- 
tographs showing the mode of occurrence of a]iatite in tlie de[)Osit of 
the Buckingham and Lievre district, as well as the relatiojis of tlie 
intrusive apatite-bearing rocks to the snrrounding gneiss. The apa- 
tite was stated to occur in intrusive dykes of pyroxenite diorite. which 
in some places ran with the foliation of the gneiss, and in other places 
across it. 
Charles Rollin Kkves — Some Maryland granites and their 
origin. 
.\ brief sketch of the granitic rocks of ]\[aryland witli a summary 
of the reasons for regarding them as eruptive in origin. 
Charles Rollix Keves — Epidote as a primar}- c()mi)onent in 
granites. 
Occurrences of the mineral in certain granites regarded as eruptive 
described, the evidences of its original nature explained and its asso- 
ciations with the closely related allanite considered. 
.1. S. DiLLER — On the Cretaceous and Tertiary of the Pacilic 
states. 
The Cretaceous of California, composed of the Knoxville, llorsetown, 
Wallala and Chico beds, has hitherto been regarded as an interrupted 
series. The Shasta (Lower Oetaceous) comprising the Knoxville and 
Horsetown beds, has been supposed to have been separated from the 
Chico (Upper Cretaceous) by a long time interval, the latter ])art of 
which was Ijelieved to be represented l)y the Wallala beds. 
P^xtensive field studies of the stratigraphy and collections of fossils 
from over eighty different localities in the ( Jretaceous show that the 
Wallala is a ])art of the Chico and tluit the Shasta and Chico are not 
only conformable, but that over one-fourtli and nearly one-half of the 
Shasta fossils continue up into the Chico. It is evident that there is 
faunal as well as stratigrai)hic continuity and that the sedimentation 
was uninterrupted throughout the Shasta-tJhico series 
This series is unconformable on the Jura-Trias and Paleozoic rocks. 
About the close of the Jurassic in the northern Sierras and Klamath 
mountains of California, the older strata were raised above the sea 
and e\|)Osed to sul),rrial degradation. ]>uring the ( 'retaceous t he 
land sul)sidt>d and tlie sea transgressed upon the western base of the 
Sierra Nevada and almost the whole of northern (California and Ore- 
gon, forming deposits of the older residuary material l)ut little re- 
moved from its source. 
In Oregon the Eocene is unconformal)le on the Shasta-Chico series 
in such a way as to show the upturm'ng and erosion of that series at 
the close of the Cretaceous. Of tlie mountain forming epochs on tlie 
Pacih'c coast, the one al:iout the close of the Jurassic and the next at 
the close of the Cretaci'ons are considered to lie among tlH> greatest. 
T. W. Si'.wi'oN.On the l''ar>n:is of the Shasta and (Miico 
l-\>rniatioiis. 
The ( 'retaceous deposits of the I'acilic coast of the liiited Slates 
have hitherto been supposed to contain at least two distinct faunas, 
the older of which characterizes the Shasta formation while the later 
occurs in the Chico and has been supposed (o he int imalely ('(iiinecled 
