82 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
and below the May Pen formation. Its relations with the Bowden 
beds of our section are not established. It apparently occupies an in- 
termediate position between the Moneague and the Bowden. 
Tue COASTAL SERIES. 
Older Portion. — The Bowden and Allied Formations.! 
This series includes a class of formations which represent the products 
of events more recent in the history of the Jamaican sequence than 
those hitherto enumerated. Its members occur around the coastal perim- 
eter of the island, principally along the margins of the sea at altitudes 
nowhere exceeding 250 feet, and deposited unconformably against the 
sides of an older mainland. Here and there on the south coast they 
fill previously formed erosion plains. "They were all made during epochs 
subsequent to an epoch of elevation whereby the white limestones of 
the Oceanic Series and all preceding formations had been elevated into 
land, had undergone tremendous denudation, and had again suffered 
partial marginal subsidence. 
They are of four types of formations, to wit: beds of impure marine 
limestone, gravel, and marl; alluvium of the Kingston type; elevated 
coral reefs as illustrated in the Barbican and Hopewell formations ; and 
littoral deposits of calcareous mud, with embedded fossils of contempo- 
raneous origin with the elevated reef formation. The four types in 
their general lithologic characters are analogous to the marine littoral, 
alluvial, and. coral reef formations now being made around the margius 
of Jamaica. 
The Bowden Beds.2— The Bowden and allied formations of later Ter- 
tiary age constitute the older beds of the Coastal Series and are all 
marginal to the main upland mass of the island. They apparently rep- 
resent a series of fringing formations extending around the older Plateau 
region. These in turn are bordered by still later and lower lying 
formations. 
Along the south coast of the east end of the island, between Morant 
Bay and Port Morant, there is an extensive occurrence of gravel beds 
less than 50 feet in thickness, containing rolled specimens of nearly 
every Species of voleanie rock found in the island, which grades up- 
wards into an impure stratified brown and buff colored marl, the latter 
1 The * Yellow Limestone " of Etheridge, Wall, Jones, Woodward, and others; 
not the “ Yellow Limestone” of Sawkins and Brown. 
2 This name is adapted from Dall. 
