. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. HILL: GEOLOGY OF JAMAICA. 81 mation. In this region the Cobre formation is very much honeycombed, and weathers into blood-red soils. At one place where laborers were blasting unusually large masses of the limestone, specimens from its in- terior were secured, which clearly showed the red iron blotches in the interstitial cavities. There are a number of isolated outliers of this formation standing in the midst of the Liguanea and other plains composed of later alluvium in the parishes of St. Catherine and Clar
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. HILL: GEOLOGY OF JAMAICA. 81 mation. In this region the Cobre formation is very much honeycombed, and weathers into blood-red soils. At one place where laborers were blasting unusually large masses of the limestone, specimens from its in- terior were secured, which clearly showed the red iron blotches in the interstitial cavities. There are a number of isolated outliers of this formation standing in the midst of the Liguanea and other plains composed of later alluvium in the parishes of St. Catherine and Clarendon, as shown in Figure 26. Tâ*âIââr ' I ' I ⢠! â I â -I â -^-' T -â . 'â . -^ â ' I -I I I ' âr-- I -r. Figure 26. Outlier of Limestone in Liguanea Plain, near Spanishtown. a a, Cobre Limestone, b h, Kingston Formation. These are of the type known in America as monadnocks. Two of these may be conveniently seen on the Kingston road a mile or two east of Spanishtown.^ These consist of the same limestone as that seen in the Bog Walk section (see Fig. 25). At the convict quarry back of Rock Fort, about four miles east of Kingston, where Long Mountain bluffs against the seacoast, a superb exposure of limestone has been made by quarrying. It is so lumpy that it is worked by the pick and used for road metal. Under the microscope it is composed of numerous undetermined species of Forami- nifera, entirely different from those of the Montpelier and Cambridge beds. In the western group of parishes, forming the county of Corn- wall, it may constitute the summit formation and pointed hills of the cockpit country. This idea is suggested by the lithologic aspects of the rocks comprising these hills, and from outcrops in Manchester along the highlands bordering the Montego Bay Railway. Close research has not been made to determine this. A prominent feature of the Cobre formation is the blood-red residual subsoils which everywhere result from its surface decay. From the Bog Wa
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