JOURNAL 
OF THE 
WASHINGTON ACADEMY OF SCIENCES 
Vou. 13 Aueust 19, 1923 No 14 
GEOLOGY.—Siratigraphy of the Virgin Islands of the United States 
and of Culebra and Vieques Islands, and notes on eastern Porto Rico. 
T. WayLAnp VaAuGHAN, U.S. Geological Survey. 
CONTENTS 
Tied I ack NEA A «ape te «pe chad = «sin pls «cts REE Cs CTO 2a bc 303 
TOGA talk Sue PENETAA TERUUTES. «5 uc 5 3:< %, «60.0 5,207, «-syua eee nee ae es oe ee ee eae 304 
BPM E EISEN tien ied ey eis oes S os os. s ov ss sn: « «0 5:0: 6s, Sig ROGER RR OTE cokes re ape cie re oe. ED 
nippes teestinecoussrocks. 77/054. 22.0.) oS oS a ce cas eee Be anne 6 305 
RG EOE: cad awbiens «a exe oes’ « LERee AR aT Ae TUR: See ee 305 
YAMA aD TINS via cg atols'c, « aaa «+ pi yc o-ayaue SA ee ER IS Rak Cs a ee 306 
RR ORME Mecca ayes a < 3 +.» Bie kai oye. 3, 0, 0c eet tn ann Ds eee ae ee re 306 
PESTLE PRINP ORES IIR Es og vas sas Woe os 2 hee es Pe ee erent eee ae ee 307 
ACEO UTES escyictes bk ce ae RPI rie ot A A heme el ed ee 307 
ISALET HAE ORLORERICO,, 0.0... 50.4 «dnd doves ainteye POR Rg en eee eld te eee el 307 
pumunary scatement on Cretaceous rocks.2 32 04. sats coe cbel. ss cokes an 308 
eM TENS ONCTIUSs © oo 6 cs oc c'e sec v's « oe 0e cc a etee Eee oe ater ta > o/c, eee 308 
CLUE HP RTIE ER. Cok ok a) dU eee oes oe ee ers sot eee 308 
ARH Me Saas ae! Yo lngee faosns: Chere 2 a = aT oe ee aT. Cake Lita ote 309 
PTE SUB OCENG: 5 « 5 ic «hors. ¥ «hos bate oy chee ee en aioe eae ee 309 
Pronsey HpDEr CLPOCENC.... .. .4%.i.cc mabe Melee ou ae mide als atin os 309 
MUIIEBAGO LL TEOSD Al SE RS SAR a Ce oie a che oe ye CRI et 311 
Pee Deals iv els fe c,2 nieces Siac k «JA See Sey SR ta Saale a A Meee te 311 
PSS OPe ONO ARGO), ooo.» 5 ais 5,3 ae Sager Near ain eid eeaeae ee eldeed Ae ee 313 
Summary statement on deposits of Tertiary age................... a ca 313 
EEE Se es SP SEs o's! o/s ne emo Da Ea ers woe Sea Fai cial. tiatate 314 
Peimnry ei eeolomionnispory 105 ois 22229). 1 a a eee 314 
INTRODUCTION 
The present paper briefly summarizes some of the results obtained 
from a geologic reconnaissance I made of the islands of St. Croix, 
Saint John, Saint Thomas, Culebra, and Vieques and of the eastern 
1 Published by permission of the Acting Director of the U. S. Geological Survey. 
Received May 11, 1923. 
303 
