HILL: GEOLOGY OF JAMAICA. 99 
The foregoing descriptions of the Soboruco practically include all locali- 
ties studied by us, except the coast adjacent to Savanna-la-Mar. The 
Observations include points around the entire perimeter of the island 
except the extreme west coast and the south coast west of Kingston. 
N Nit m 
d SEA LEVEL 
A P. 
FiaumE 87. Cross Section, West Side of Lucea Harbor. 
a. Soboruco. 
b. Elevated Reef. 
c. Folded Richmond Beds. 
Those portions of the coast not seen by us have been sufficiently de- 
Scribed and mapped by the official surveyors to show that the Soboruco 
Occurs at many points in them. From Brown's description of West- 
Moréland * it is evident that the ten foot or coast Soboruco, and the 
twenty-five foot or Barbican Soboruco, are each represented there at a 
different. locality, the former between Scott Cove and White Hill Point, 
and east of Homer Cove, and the latter at South Negril Cliff. The 
Same author? describes, in a general way, the Soboruco in St. Elizabeth, 
Where it forms low cliffs 15 or 20 feet high and rests upon the “ White 
‘imestone.” He ascribes it to a Post-Pliocene age. No definite men- 
tion is made of this formation along the coasts of Manchester or Claren- 
don (Vere) by the Jamaican geologists, although it is placed upon the 
Map by them. 
Coxonustons CONCERNING THE ELEVATED REEFS AND THE HISTORY OF 
Reer Buinnina CORALS IN THE JAMAICAN SEQUENCE. 
The old reefs grew upon marginal benches or terraces, which previous 
1o their submergence were probably wave-cut constructional or grada- 
tional plains like those now seen upon the land configuration. As they 
“Uccessively rose during subsequent elevation to within 20 fathoms or 
less, the zone of coral growth, they were occupied by the polyps which 
*nstructed the reef which has since been elevated into land. 
That Jamaica was once a more extensive land than now, with benched 
A terraced margins which were submerged by subsidence, is shown not 
"y by the adjacent submarine configuration but by the elevated reefs 
1 Jamaican Reports, p. 228. 2 Op cit, pp. 208, 209. 
