14 BULLETIN : MUSEUM OF COMPARATIVE ZOLOGY. 
Our classification will differ from that of previous writers as follows. In 
accordance with modern usage, local geographic names will be usod for 
formations instead of lithologie, chronologic, and paleontologic terms, so 
that where the age or relations of formations are not known, their 
identity is nevertheless preserved. Hence the terms “White Lime- 
stone,” “Yellow Limestone,” “Trappean Series," ** Metamorphic Series,” 
etc., will be abandoned. 
Inasmuch as this paper will deal largely with the formations of the 
Tertiary period, it is necessary briefly to explain the nomenclature to be 
followed. Until very recently, after the example of Dana, the American 
Tertiary has been divided into three epochs, the Eocene, Miocene, and 
Pliocene. Dall has recently adopted the European nomenclature, which 
accepts a fourth epoch, the Oligocene, interpolated between the Eocene 
and Miocene, which includes the Vicksburg stage of the Upper Eocene 
(American usage) and the older beds of the Miocene. "Throughout this 
paper Dall’s four divisions, as accepted by him, will be used. 
Investigations upon which the present report is based were mado in 
two visits to the island in the winters of 1896 and 1897. These 
included over eight hundred miles of traverses, with studies of the 
typical localities of the previous observers, and examinations of excellent 
new exposures of structure afforded by recent railway construction, 
Careful study of material in the Museum of the Institute of Jamaica was 
made, embracing the typical collections of the official surveys. Collec- 
tions of the rocks and fossils were made wherever possible, and permis- 
sion was given by the officials of the Institute of Jamaica to borrow 
such specimens as were desired. 
My thanks are due to their Excellencies Governor Sir Henry and 
Lady Blake, the Governing Board and Professor J. E. Duerden of the 
Jamaica Institute, Mr. L. Frank of the Jamaiean Railway, Mr. Henry 
Vendryes, Captain Baker and sons, Mr. Arthur James, and many others, 
for their hospitable aid in our researches. | 
The following specialists have kindly assisted in a careful study of 
materials collected: Mr. Whitman Cross, in the study of the petrography 
of tho igneous rocks; Mr. T. W. Stanton, in the study of the Cretaceous 
and Eocene Mollusca; Mr. R. M. Bagg, Jr. of tho New York State 
Museum, in determining the fossil Foraminifera; Mr. G. B. Shattuck, 
of Johns Hopkins University, in studying the Cretaceous and Eocene 
Mollusca. Special thanks are due to Mr. T. Wayland Vaughan for his 
1 Mr. Shattuck has been unable to complete these studies for publication in this 
Report. His results will be presented separately at a later date. 
