2 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



PAGE 



Part II. — The Geologic Structure and Sequence 41 



Tlie Four Types of Geological Forraations 41 



Table showing Sequence of the Rocks 42 



The Blue Mountain Series 41 



rrevious Attempts at Classification 43 



The Basement Beds 44 



Absence of Exposures of a Crystalline Basement 44 



The Clarendon Section 45 



Fossiliferous beds of the Lower Blue Mountain Series .... 48 



The Jerusalem Mountain Section 49 



The Plantain Garden Iliver Section 51 



The Volcanic Material of the lower Beds 62 



The Richmond Beds 53 



Lithologic and Stratigraphic Character 58 



Tlie Port Maria Section 64 



The Richmond Beds in St. George and Metcalf 55 



The Moral Cut Section 65 



Minlio Beds 67 



Reasons for Considering of Eocene Age 57 



The Cambridge Formation 57 



Its Transitional Nature 68 



The Catadupa Beds 58 



Section along Great River Valley 58 



The Chapelton Beds 61 



Extent and Occurrence of the Cambridge Formation .... 61 



Previous Confusion in Literature 63 



Usage of the term Yellow Limestone 63 



Peculiar Stratigraphic and Paleontologic Features of the Cam- 

 bridge Beds 64 



The Wliite Limestones of Jamaica 65 



Introductory Statement 65 



Previous Difficulties in Interpretation of the White Lime- 

 stones ... 65 



Variety of Age Classifications hitherto presented .... 65 



Diversity of Origin of the Wliite Limestones 67 



Tlie Oceanic Series, or Upland White Limestones 69 



The Montpelier Beds 70 



Lithologic Cliaracter 70 



Proofs of Deep Water Origin 71 



Microscopic Character 71 



Extent and Distribution 72 



Age of the Montpelier Beds 75 



The Moncague Formation 76 



Shallower Character than the Montpelier 76 



^^Icrosc()pic Structure 77 



Extent and Occurrence 77 



The Cobre Formation 78 



The Bog Walk Section 79 



Extent and Occurrence 80 



The Coastal Series 82 



Types of the Coastal Formations 82 



