NOTES ON THE JAMAICA EARTHQUAKE 709 
although slight displacements took place along some of the fissures. 
In one instance near Rockfort the road along the shore seemed to 
have fallen with reference to the sidewalk a distance of four to six 
inches, and at other points a sinking of the road of from one to two 
feet, doubtless owing to flowage of the underlying sand, seems to 
have occurred. In other cases the motion appeared to be the reverse, 
the segment containing the sewer sinking with reference to the road. 
Extrusion oj sand and water—As already mentioned more or 
less sand and water was extruded from fissures near the water front 
at the Victoria Market, but, owing to the toughness of the alluvium, 
the depth of the water table, and the absence of large earth waves, 
the conditions were unfavorable for such action. No craterlets 
were reported, and there appears to have been no extrusion from 
the cracks along the Rockfort road as described above. 
Change of level—No noticeable change of level of the land, 
except in the fissured and slumped zones at the immediate margin 
of the sea has been recognized. So far as can be determined the 
water stands at the same level along the wharves as before the shock. 
SAND SPIT (PALISADOES) 
Extending from the mainland about four miles east of Kingston 
a long spit known as the Palisadoes stretches westward, a distance of 
eight miles, forming the harbor of Kingston. Patches of reef limestone 
representing original islands, reach the surface of the spit at at least 
two points. With the exception of these rocks the entire mass 
is composed of loose wave- and wind-drifted sands, standing 
only a few feet above sea level and saturated with water nearly to 
the surface. ‘The conditions for the propagation of earth waves and 
for disintegration and slump were, therefore, far more favorable than 
in the tough alluvial deposits at Kingston, and, as would naturally be 
expected, the destruction was much more severe. On the limestone 
patches, on the other hand, the action was similar to that on the 
mainland. 
Fissures and extrusions.—Fissures and extrusions of sand occurred 
at various places on the Palisadoes, especially near the point of con- 
nection with the mainland. Here long lines of closely spaced faults 
parallel to one another and to the sea margin were formed. The 
