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hill: geology of Jamaica. 103 



Garden River and the coast south of Moraut Point; the Salt Ponds 

 near Yallahs Point; bordering Hunt Bay between Cobre liiver and 

 Apostle's Battery on the west side of Kingston Harbor ; from Cabiretto 

 Point to West Harbor on the east coast of the district of Vere. Claren- 

 don Parish ; along the south coast of Vere and Manchester from Port- 

 land Ridge to Cut River ; between Star Cut Bay and Scott Cove ex- 

 tending inland adjacent to Black River on the southwest coast of St. 

 Elizabeth Parish; from Bluefields Bay to St. John Point in Savanua- 

 la-Mar ; along the truncated west coast of the island between South 

 Negril Point in Westmoreland Parish to Orange Bay in Hanover Parish, 

 and around Green Island harbor, Hanover Parish. 



Where these morasses extend a few miles inland up the rivers they 

 occupy eroded indentations cut out of the lower Soboruco or Liguanea 

 levels, as is especially well shown at Montego Bay, Long Bay, and the 

 mouth of Black, Milk, Cobre, Plantain Garden, and Green Island Rivers. 

 In one or two places, as along the north coast between Palmetto Bay 

 and Buff Bay, the Salt Ponds, and elsewhere their configuration strongly 

 suggests that they were originally lagoons on the interior side of barrier 

 reefs. 



These morasses are most extensive at the mouth of Black River, St. 

 Elizabeth, and at Long Bay, west end ; and near Morant Point, east end, 

 where they extend back from the sea for two or more miles. Elsewhere 

 they are elongated narrow strips less than a half mile in width and occur 

 between the sea and the back coast border. 



These formations occur relatively to the Manchioneal, Hopewell, and 

 Barbican formations of the Coastal Series, in the same manner that the 

 Coastal Series, as a whole, occurs relative to the rest of Jamaica, 

 i. e. they are deposited in eroded bights and on eroded plains cut out 

 of the preceding formations. 



The Bogue Island Formation. 



The last to be described, but by no means the least interesting forma- 

 tion of the Jamaican sequence, is that which composes a number of atoll- 

 like islands in Montego Bay about one mile west of the city. These lie 

 just off shore in the greatest indentation of the bay. Looked down 

 upon from the elevated back coast hills, as seen in the illustration 

 (Plate XX.), these islands appear to be a group of typical coral atolls, 

 consisting of small circular belts of land enclosing interior lagoons. 

 When visited and closely inspected they are found not to be of this 

 character. 



