J. D. Dana—Taconic Rocks and Stratigraphy. 487 
wg — list contains fifty-four items not counting the one of 
Nov which s even are in small type. They may be geo- 
gr chins: classified thus 
mwesiprer boa eseae : 
New 
giao sta 
Mississippi Valley 
Pacific a Senaeror ee we 
West Ind 
Central patent and Colombia 
eru 
Uruguay 
Deduct for Aug. 10, counted twice 
ao on bo 
at caee | FP rownDPre aap 
By seasons they are classified thus : 
Winter, 12 (Dec., 2; Jan., 8; Fe b. 2)3 Spring, 15 (Mar., 8; 
Apr., 7; May, 0); Summer, 8 Gane, 4; July, ; Aug., 4); ‘Au- 
m 9 pt., a ee 10); Sp rin ing and Summer 
together, 23; Aut d Winter together, 3 
he following localities ous shaken on ig or more days, viz: 
os Angeles, Cal., Jan. 4, Jan. 16, Oct. 22; San Francisco, 
Jan. 25, Mar. 15, 25, Ju ly me Nov. 12; Oakland, Cal., Mar. 25, 
April 17, 20; Eureka, Cal, Jan. 27, April 6, fae & Concord, 
N. H. , Aug. 10, Nov. 12, 
The only shocks causing po damage were Nov. 5, Panama; 
Nov. 6, Colombia; Nov. 22, Lima, and Aug. 10, Middle States. 
Princeton, March 28, 1885. 
Art. LV.—Taconic Rocks and Stratigraphy ; by 
James D. DANA. 
[Continued from page 222.] 
V. Metamorphism and Mineral Constitution in the Taconie Re- 
gion, gradational from West to East and from North to South. 
THE succession in the different lithological areas exhibited 
n the map of the southern portion of the Taconic region (pu 
lished with the perce ne part of this paper) is as follows, 
€ginning on the 
a 1.) Winchell’s Ridge of schist and other small ridges in 
Copake north of it. 
2) ae aed belt of limestone, passing through Copake 
and Mille 
(3.) The aden area in Salisbury, with its isolated schist 
ridges, extending eastward to the Housatonic River and con- 
tinued across the river far into Canaan (the river being the 
Political boundary between the two towns). 
(4.) Schist to the eastward of the poh ES limestone in 
