. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. SKEATS: CHEMICAL COMPOSITION OF LIMESTONES. 99 dirt lines round the margins of the organisms, the interior being recrystallized calcite. No. 211. Most of the slide is occupied by the section of a coral, whose spaces are filled partly with " mud," partly with aragonite crystals continuous with the coral fibers, and partly with clear calcite. No. 209. Large coral fragments and other organisms make up the bulk of the rock, and are cemented together by a deposit of fibrous calcite crystals. NORTH OF FLY
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. SKEATS: CHEMICAL COMPOSITION OF LIMESTONES. 99 dirt lines round the margins of the organisms, the interior being recrystallized calcite. No. 211. Most of the slide is occupied by the section of a coral, whose spaces are filled partly with " mud," partly with aragonite crystals continuous with the coral fibers, and partly with clear calcite. No. 209. Large coral fragments and other organisms make up the bulk of the rock, and are cemented together by a deposit of fibrous calcite crystals. NORTH OF FLYING FISH COVE. First Inland Cliff. Number. Height. Calcium Carbonate. Magnesium Carbonate Insoluble Residue. 1032a 300' — 1032 3007 211 250' — 209 210' — 208 200' .024 206 160' — 203 90' — 201 80' — 200 50-60' —. No. 208. Coral fragments, sections of lamellibranchs, and other or- ganisms, including several specimens of Globigerina, are set in a matrix of dark calcareous " ; In one part of the slide fibrous calcite in- vests the organisms. No. 202. A limestone with a muddy matrix, containing coral frag- ments and many specimens of Globigerina. Muddy, fibrous incrusting crystals of calcite invest some fragments. No. 200. A limestone, largely composed of coral fragments, with aragonite crystals in some cavities. A large amount of fibrous cement- ing calcite occurs. Round Lithothamnion, scalenohedral crystals were first formed, and then an outer layer of fibrous calcite, while a plate of calcite has surrounded an echinid spine, the deposited material being in optical continuity with the calcite of the organism. South-east of Phosphate Hill. — Below the second inland cliff another cliff occurs between the heights of 200 and 300 feet, which forms the newer fringing reef in this part of the island. VOL. XLII. — no. 2. 4. Please note that these images are extracted from sc
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