. Scientific survey of Porto Rico and the Virgin Islands. Scientific expeditions. <'H-:\TIFI(' SVh'VKV OF I'fU.'TO h'K lf(H-k^ of rJiyoJitic roin|;ifioit nvv hIso .(iiii<. vntv. T\\v lu'st fXaiiipl.; was .<(.(.!! iiurilu'jis^t of La, Tonvcilla in harrid Ikrrrtiicii^. This is .,, porpliyrilic wilh |)lu'iHHi'ysts ol' qiiiirt/., orrlnn-hisc. jiihI mica in rt Jim-gmiiicd aciilii- ,uToiiiHliiirtss. Tiic wJiolr rock luis subse<ni<'iitly Ihm-h hiMlily siTiciiiwd (Kiu-. 1 <;?,,). hi the F» Valicy jiisl cast of Ilch-- several rlivolire (iraiiitie
. Scientific survey of Porto Rico and the Virgin Islands. Scientific expeditions. <'H-:\TIFI(' SVh'VKV OF I'fU.'TO h'K lf(H-k^ of rJiyoJitic roin|;ifioit nvv hIso .(iiii<. vntv. T\\v lu'st fXaiiipl.; was .<(.(.!! iiurilu'jis^t of La, Tonvcilla in harrid Ikrrrtiicii^. This is .,, porpliyrilic wilh |)lu'iHHi'ysts ol' qiiiirt/., orrlnn-hisc. jiihI mica in rt Jim-gmiiicd aciilii- ,uToiiiHliiirtss. Tiic wJiolr rock luis subse<ni<'iitly Ihm-h hiMlily siTiciiiwd (Kiu-. 1 <;?,,). hi the F» Valicy jiisl cast of Ilch-- several rlivolire (iraiiitie intru>ives are wiilespread iuhI fairly alnnMlant. All ef i!is southwesl of ."^lorovis is of tliis romposiiion. T roek is li<.-ht-e<)h,r(.il. with seaifered )»a1ehes of the darker ferroimpmiesi minerals, and eearsely crystalline in Kwtiire. It is efnnposed ehielly qnartz. ( ortho«-lase. and liornhlende. with seatfered titam. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York Academy of Sciences. New York, : The Academy
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscienti, bookyear1919
