. Un contributo alla American thalassography; tre crociere di gli Stati Uniti costa e Geodetic Survey sistema di cottura a vapore "Blake," nel Golfo del Messico, nel mar dei Caraibi, e lungo la costa atlantica degli Stati Uniti da 1877 a 1800. Blake (nave); animali marini -- Oceano Atlantico; sedimenti marini; Oceano. Caratteristica di DEEP SEA tipi. RIIIZOPODS. 159 rhizopods fiorire, tra 150 e 100 braccia consiste principalmente di un gessoso, resistente, amorfo ooze, - una modificata pter- opod e globigerina ooze. Mescolato con questo sono grani di sim- ilar materiale, ma di una maggiore coerenza, toget

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. A contribution to American thalassography; three cruises of the United States Coast and geodetic survey steamer "Blake, " in the Gulf of Mexico, in the Caribbean Sea, and along the Atlantic coast of the United States, from 1877 to 1800. Blake (Ship); Marine animals -- Atlantic Ocean; Marine sediments; Ocean. CHARACTERISTIC DEEP-SEA TYPES. RIIIZOPODS. 159 rhizopods flourish, between 150 and 100 fathoms, consists mainly of a chalky, tough, amorphous ooze, — a modified pter- opod and globigerina ooze. Mixed with this are grains of sim- ilar material, but of a greater consistency, together with dead shells of pelagic moUusks and foraminifers and a great number of the tests of dead rhizopods, which once lived on the bottom and among' which flourished in great abundance the innumer- able large and small species characteristic of the Caribbean dis- trict. The majority of the largest rhizopods occur on the bottom, which is covered with the coarser fragments of coral- lines, annelid tubes, and other pieces of limestone, soldered to- gether more or less compactly, and transformed into rough masses and lumps resembling coarse mortar or gravel. Associated with the arenaceous, siliceous, and calcareous rhizo- pods which undoubtedly live upon the bottom, we find the tests of Globigerinse, Hastigerinae, Pulvinulinse, and many others which have also been observed as pelagic. For a time it was supposed that the deposits so widely extended were due to Glo- bigerinae living on the bottom, but the evidence gradually brought forward by Bailey, Johannes Muller, Pourtales, Major Owen, and especially by Mr. Murray of the "Challenger, " seems to leave no doubt that the Foraminif era to which the globigerina ooze is due are pelagic, the ooze being formed by the dead shells after they have reached the bottom. One of the most common types of rhizopods is BUoculina ring ens (Figs. 484, 481: a, 484 6), a most abundant form in. Please note that these images are extracted fro

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1880
• booksubjectocean
• bookyear1888