hill: geology of JAMAICA. 



55 



The Richmond formation is exposed in all parishes of the east adjacent 

 to the JJlue Mountain Ridge, but in a greatly disturbed condition. It 

 is best seen in the north coast parishes of Portland, especially the dis- 

 tricts of St. George and Metcalfe in St. Mary Parish; and in Hanover, 

 in the bluffs and hills of the back coast country, east, west, and south 

 of Lucea. Excellent and typical exposures are seen between liichmond, 

 district of Metcalfe, St. Mary Parish, and Ainiatto Bay, the beds occur- 

 ring in many short open anticlinal and synclinal folds. At Richmond 



Figure 18. Section showing Riclimond Beds at Riclimond. a, Conglomerate 

 grading into b, alternations of Conglomerates and Clays. 



a bluff in the banks of Flint River well shows the thin alternations of 

 evenly bedded shales and sandstones overlying the conglomerates. (See 

 Figure 18.) 



At Moral Cut, near Moral Station, thin flags of impure arenaceous 

 limestone appear in alternation with the beds of shale (Fig. 19), and 

 weather out in great quantities. This exposure is part of an openly 



FiGURK 19. Folded Richmond Beds, St. Mary Parish. 

 (From the Jamaican Reports.) 



folded anticline, over a mile in length, consisting of rusty brown gravel 

 below, and shales, limestones, and sandstones above. In the west bank 

 of Wag Water the Richmond beds are vertical. Many other excellent 

 exposures occur in this portion of the parish of St. Mary, constituting 

 the western terminus of a belt of the formation which extends thence 

 in a south of east direction through Portland Parish. It is impossible 

 to obtain continuous sections of these beds, owing to minute folding 

 and concealment of contacts by vegetation and overlapping formations. 

 The Richmond beds of this district succeed without break the ]\Iinho 

 formation (Purple Shale and Conglomerate Formation of Wall), which 



