. RECORDS OF MEETINGS 435 



them limestones. In this district occur a group of thermal springs wliich 

 are directly related to a great fault. It is of interest in this connection 

 to note that J aside from those in the Tertiary limestones (which have no 

 bearing on this problem) the onl}' true springs in Porto Rico are thermal 

 springs — three in number — related to fault zones. 



Dr. Reeds said in al)stract: During June and July, 1915, two members 

 of the staff of the American Museum of Xatural History — Dr. Chester A. 

 Eeeds, in charge, and Mr. Prentice B. Hill, interpreter and assistant — 

 collected fossils in Porto Eico under the auspices of tlie Xew York Acad- 

 emy of Sciences and the Porto Eican Government. 



The collecting was confined almost entirely to the sedimentary l)eds of 

 the "older" and "'younger" series defined l^y Professor Berkey^ in liis 

 report, "Geological Eeconnaissance of Porto Eico." It was conducted 

 from the following centers : Aguadilla, San Sebastian, Juana Diaz, Ponce, 

 Y^auco, San German, Aiecibo and San Juan. 



The most prolific localities in the "younger" series were as follows : the 

 Collazo Eiver and vicinity near San Sebastian: the railroad cut, west 

 abutment of the American Eailroad bridge over the Guajataca Eiver, near 

 Quebridillas ; the shale and limestone exposures to the northwest and 

 southwest of Juana Diaz on the Jacaguas Eiver; on the Ponce-Penuelas 

 road 4 km. west of Ponce; at Km. 25 and exposures in the river bank 

 north of Guayanilla; the east wall of Guanica harbor; on the Arecibo- 

 Utuado road at various places between Km. 66 and T2 ; and on the Manati- 

 Ciales road between Km. 1-2 and at Km. 9. 



Fossils were collected from the dense limestones of the "older"' series 

 of the basal complex at the following localities : from the exposures to the 

 northwest and southeast of the Guayabal Eeservoir; at and near the 

 bridge over the Descalabrado Eiver on the road from Juana Diaz to 

 Coamo; between Coamo Springs and the Coamo Eeservoir; at various 

 points along the road from Ponce to Adjuntas; near Penuelas; at Km. 

 35 on the Yauco-Sabana Grande road: from the hill to the south of 

 Yauco ; at Ensenada and from various places 1-5 kilometers northwest of 

 Ensenada; at San German; on the road to Lajas; at Lajas; at Parguera; 

 on the island off the coast and from the hills back of Parguera : from La 

 Muda; and from Trujillo Alto. 



The collection when shipped from San Juan consisted of 35 boxes, 

 weighing approximately 3100 pounds. It contains 10,000 to 12,000 

 specimens. About 10 per cent, are rock specimens and 90 per cent, in- 

 vertebrates. Only a dozen fragmentary specimens of vertebrate fossils 

 were found. Tlie specimens have been unpacked at the American Mu- 



*Beikey. C. P.: Annals X, Y. Acad. Sci.. Vol. 26. pp. 1-70. pis. 1-P.. 1915. 



