HILL: GEOLOGY OF JAMAICA. ji 
limestone by Brown, which we shall call the Cambridge formation. 
Woodward, in the text, acoidentally no doubt, omits to mention this 
important formation, and erroneously states! that the shales, No. 3 of 
the figure (our Richmond Beds), are followed by the White limestones 
of * Miocene age." For verification he refers to a previous article by 
Barrett,? in which we can find no mention of any such sequence. 
Later, T. Rupert Jones also published an illustration of a geological 
section which he said had been given to him by Barrett, “whose unfor- 
tunate death had then recently occurred.” This section, like that given 
by Woodward, shows the stratigraphic position of the Orbitoidal lime- 
stone, 6, (called “ Nodular Orbitoidal Limestone," 8 — our Cambridge 
Fieurn 2. T. Rupert Jones’s Interpretation of Barrett's Section of the 
Jamaican Sequence. 
Beds), between the black shales (Richmond) and White limestones. In 
the legend of the section the age of the Orbitoidal formation is given 
by a bracket as the “ Miocene.” This is the first section in which the 
Orbitoidal limestone (our Eocene Cambridge Beds in part) was referred 
tothe Miocene. In the same section the overlying White limestones, @, 
which we will show embraces formations of the Vicksburg Eocene (old 
usage, — called Miocene in Woodward’s paper previously alluded to) is 
referred to the Pliocene. Jones states that “he understood Mr. Barrett 
to have referred the great “White limestone” to the Pliocene.* 
In 1864 Duncan and Wall wrongly correlated the Yellow Eocene 
Orbitoidal limestones at the base of the White limestones with the 
Bowden beds (Oligocene) which occur above them, and referred the 
1 The Geologist, London, 1862, Vol. V. p. 878. 
2 «On Some Cretaceous Rocks in Southeastern Portion of Jamaica." Quart. 
Jour, Geol. Soc. 1860, Vol. XVI. pp. 324-326. . 
8 Quart. Jour. Geol. Soc. London, 1863, Vol, XIX. p. 515. 
* Ibid., pp. 514, 515, 
