56 bulletin: museum of comparative zoology. 



are described^ as "great masses of green and red argillaceous strata 

 and apparently belonging to a lower division of the group." 



Wall 2 gives under the name of the " Black Shale " the following 

 section of the Richmond beds in St. George and Metcalfe. 



Feet. 



Red and light yellowish shale ±100 



Thin alternations of grayish sandstone and shale weathering 

 brown ± 300 



Brownish green shale, finely laminated, black color, containing 

 alternations of thin sandstones, rubbly conglomerate, and pieces 

 of Cretaceous limestone and fossil Hippurites and Caprinella much 

 water worn ±1,000 



Purple shales finely laminated passing into metamorphosed 

 conglomerate and shale (Minho beds). 



This section makes no mention of the upper beds containing lime- 

 stones, which, in our opinion, represent a gradation into the overlying 

 Cambridge formation. 



In the northern part of Hanover Parish the Richmond beds have 

 considerable development, and, so far as composition is concerned, 

 present the same general facies previously mentioned. In this parish 

 they are exposed in the back coast bluffs from the mouth of Great 

 River westward, being capped above by the White limestones of the 

 Oceanic Series, and in their seaward extension cut into many terraces, 

 upon some of which are plastered old coral reefs like that shown near 

 Barbican, in Figures 33 to 36. Superb exposures are seen around the 

 interior end of Lucea Harbor and in the uplands to the south half way 

 across the island along the road leading toward Savanna-la-Mar. In this 

 region the beds are intensely folded, faulted, and overthrown, as shown 

 in the view on Plate XXII. It is our opinion that nothing less than 

 months of minute stud}^ of the complicated folds of this region would 

 reveal the detailed sequence of the individual members of the beds in 

 this parish. The following section may be inferred * from descriptions 

 of Brown and Sawkins. The formation names are ours. 



Richmond Beds. „ ^ 



Feet. 



Thin laminated beds of red, gray, and greenish shale . . ± 200 

 Beds of pebbly conglomerate, overlying beds of massive brown- 

 ish and gray sandstone 300 



Greenish brown laminated shale, interstratified witli thin beds 



of line-grained sandstone +2000 



1 Jamaican Reports, p. 63. 2 jbij.^ pp 121. 122. 



« Ibid., pp. 252, 263 (" Black Shale"). 



