62 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



In addition to the particular localities of the Cambridge beds men- 

 tioned, there are many others throughout the island. Near Mooretown, 

 Mt. Pleasant, and Shrewsbury, Portland Parish, are beds described by 

 Barrett/ which correspond closely with them in position, arrangement, 

 and fossiliferous remains. 



On the north side of the east end in St. Mary's and Portland parishes 

 the Cambridge beds are much more calcareous than elsewhere, as seen 

 in an exposure at the foot of the bluffs west of Port Antonio, where its 

 characteristic fauna is found in beds of pure white limestone and calca- 

 reous marl much resembling the overlying white limestones of the Mont- 

 pelier formation, into which it here grades without perceptible break. 

 A considerable mass of the white marl at this locality is composed of 

 large granular Foraminifera very like those found in the black shale of 

 the Catadupa locality. This white foraminiferal marl is probably the 

 same as that from near Carron Hall, St. Mary,'' in which parish, near 

 Guy's Hill, the typical Cambridge fauna is found just below the flint 

 beds of the Montpelier. At this locality the beds have their character- 

 istic variations of color. Near Preston Falls, in the same parish, the 

 lime beds of the formation grade down into the Richmond beds. In 

 this parish Wall estimates the thickness of beds which we place in this 

 formation described by him, together with a part of the overlying white 

 limestones, under the name of the " Calcareous Marl," ® to be between 

 500 and 600 feet. 



In the district of St. Thomas-in-the-Vale, parish of St. Catherine, the 

 Cambridge formation, with the typical Chapelton fossils, consists of yel- 

 low marl and red and blue colored clays with impure lignite, and is 

 about 300 feet thick. It is well displayed in the hilly district southwest 

 of Guy's Hill.'* Near Spring Vale, in the same parish (St. Catherine), 

 south of Linstead, at the southern angle of the St. Thomas basin, the 

 Cambridge beds are composed of yellow clays and sand extremely rich in 

 Ostrea and Foraminifera. In the parish of Manchester, the Cambridge 

 beds occur at many places, notably at Spice Grove, Amby, Lower May- 

 field, Oxford, Cowie Park, along Hector Kiver and at Christiana. A 

 good description of the beds at these localities is given under the head 

 of "Yellow Limestone" by P>rown.5 The following section of these beds 

 on Hector River is by him : — 



1 Jamaican Reports, p. 84. ^ Ibid., p. 129. 



8 Ibid., pp. 129, 130. 



* Ibid., p. 130. Described under name of " Calcareous Marl." 

 6 Ibid., pp. 1G9-171. 



