hill: geology of JAMAICA. 6 



PAGE 



The Bowden and Allied Formations 82 



Tlie Buff Bay Beds 84 



The May Pen Beds 84 



The Porous Formation 85 



The Manchioneal Formation 8G 



Extent and Relations 86 



The Kingston Formation 88 



The Elevated Keefs 90 



The Nature of Keef Rock 90 



Occurrence around the Margins of Jamaica 90 



Tiie Coast Reef or Soboruco 92 



The Barbican Reef 92 



The Hopewell Reef 92 



Conclusions concerning the Elevated Reefs and History of Reef Build- 

 ing Corals in the Jamaican Sequence 99 



Miscellaneous Coastal Formations contemporaneous in Origin with the 



Elevated Reefs 100 



The Falmouth Formation 101 



The Montego Formation 102 



The Bogue Island Formation 103 



Swamps and Morasses 103 



Pseudo Atolls of Montego Bay 104 



General Geology of Montego Bay 105 



The Igneous Rocks of Jamaica 106 



Absence of Exposures of Basement Crystallines 107 



Classification of the Igneous Rocks 107 



The Boulder Material of the Blue Mountain Series 107 



Tlie Hornblende-diorites, Porphyries, and Granitoid Rocks . . 109 



Extent and Occurrence 109 



Proofs of Intrusive Nature Ill 



Evidence of Post-Eocene Age 112 



The Low Layton Eruptives 112 



The supposed Low Layton Volcano 112 



Proofs of Pre-Pliocene Age 113 



Metamorphic Influences of the Tertiary Eruptives . . . 114 



Part III. — Paleontology of the Jamaican Sequence 115 



Scarcity of Fossiliferous Horizons 115 



Influences of Environment upon Life 115 



Difficulties surrounding Discussion of Jamaican Paleontology .... 115 

 Influences of mistaken Stratigraphic Conceptions upon Paleontologic 



Literature IIG 



Influences of Environment in producing Peculiarities of Faunas . . 116 



The Cretaceous Fossils of Jamaica 117 



List of reported Species 117 



Peculiar Generic Association 118 



The alleged Occurrence of Orbitoides in the Jamaican Cretaceous 118 



Corals of the Jamaican Cretaceous 121 



The Rudistean Fauna 122 



The Eocene Faunas • 123 



History and Literature of conflicting Views on the Existence of 



the Eocene in Jamaica 123 



