. Scientific survey of Porto Rico and the Virgin Islands. Scientific expeditions. IIODG-E, aEOLOaV OF THE V0AM04S-UAY A MA IH^^TIflCT ] fi The appearaiico of the which forms this series is viiriahlo, •:vi fe}itur{3s aiv. s() ccxiistiint tliat the rock may l)o I'lu^'Ogiiized nt a ii^laiute and can be eimly (listingiiisliod froiu all other hriiestoiioF oi-eiirriiig III }*ort() Bico. The c«iIor varies from oliaJk' white to ereaiii or to pale lilac, 'rhc grain is verv Jiiie in most oe(;urrejii;es, but iii part it is medium, .Hid the size of the grain increases to (he westwa
. Scientific survey of Porto Rico and the Virgin Islands. Scientific expeditions. IIODG-E, aEOLOaV OF THE V0AM04S-UAY A MA IH^^TIflCT ] fi The appearaiico of the which forms this series is viiriahlo, •:vi fe}itur{3s aiv. s() ccxiistiint tliat the rock may l)o I'lu^'Ogiiized nt a ii^laiute and can be eimly (listingiiisliod froiu all other hriiestoiioF oi-eiirriiig III }*ort() Bico. The c«iIor varies from oliaJk' white to ereaiii or to pale lilac, 'rhc grain is verv Jiiie in most oe(;urrejii;es, but iii part it is medium, .Hid the size of the grain increases to (he westward. Some of the rock is made up w-]iolly of crystalline liniestruu:', but bu- the uiost part it. is mottled w-ith organic aud lufT I'raguicnts wdiicli are brown, soft and uiiiy. ii-y in size frctui 1 to ;5 nim. arul are creani-colorfd, Tiifir iM'gauic elmr- •tfT is even in hand specimens, as shown hv concentric zones whicli a, fine mesh structure can be seen. Oilier varieties have a line- ?iinieil iilac-eohu-ed material stained wuth hematite, binning a matrix >r the organic bodies. The ihalli of the a1ga> of wlih-b this rock is ryc'ly eomposcrl are sliown in figures 15. li'j arid 18. Idle uiicroscopic character of this rock is most interesting. It is bmn-l • consist of at h'ast three varieties of alga-like strueture. Borne of i'"«e arc irndoubiedly of the red ealcarerm that lias a fucoi structure, fcvraminiftu'a of several speeii's arc. 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
