296 
ble breadth, having a quaquaversal dip, along those parts of the 
island visited by the author. At the north-east end, the tertiary strata 
rise into high and considerable hills, which stretch across the island 
from east to west. 
The following is the order of succession :— 
1. Summit of the hills three miles, south-south-west of the town 
of Rhodes. 
Sandy gravel and conglomerate consisting of Feet. 
pebbles ofiseaglia i.) Vy een ie ye 10 to 13 
Fine sand, with indications of false stratifica- 
tions, true dip 5° north-east.............. 10 to 15 
Gravelieer ie! mg. Oc ity aha eRe SO TSN Rd 8 
Sand, with perpendicular veins of marl...... 10 to 12 
Sand, with concretions of marl ............ 
Sang, with bands on marl ) oi) a" see ee 
2. These beds repose on an extensive formation (considered to 
be from 200 to 300 feet thick) of yellow, calcareous, shelly conglo- 
merate, the beds of which dip 10° to north-east. It contains nume- 
rous shells of the genera Pecten, Cardium and Venus, and it is the 
stone principally used in masonry. It extends to the town of Rhodes, 
and re-appears to the south of the table-land in nearly horizontal 
beds, some of which are very arenaceous. It is extensively de- 
veloped in several places along the coast, as far as Lindo, where 
it rests unconformably against the secondary limestone. 
- 3. A bed of sandy marl, containing thin bands of calcareous marl. 
Thickness not great. 
4. A thick bed of conglomerate and gravel, extending a consider- 
able distance to the south and south-west, and rising into lofty hills, 
which form steep and broken cliffs on the western cvast of the is- 
land, several miles from Rhodes. It thins out gradually further 
south, resting at the entrance of a deep valley, upon upraised beds 
of blue and white scaglia and sand. 
Near Archangelo, half-way between the town of Rhodes and 
Lindo, a similar system of tertiary rocks is extensively developed. 
About one mile north of Lindo Mr. Hamilton noticed between 
the tertiary and secondary series a thick bed of large limestone peb- 
bles, with sometimes quartz pebbles and boulders, cemented by a 
hard calcareous paste. This conglomerate rests immediately on 
the blue limestone, filling up its interstices ; and it is considered by 
Mr. Hamilton to be the lowest tertiary deposit. 
SEconDARY Rocxs.—The greater part of Rhodes consists of sea- 
glia, generally considered to be the equivalent of the cretaceous sy- 
tem of Europe. It is composed, (1.) of red and brown sandstones 
with conglomerates ; (2.) of whitish gray and red scaglia limestone ; 
and (3.) of blue limestone; but the last deposit Mr. Hamilton 
considers to belong to a different epoch. 
1. The sandstones and conglomerates occur near the centre of 
the island, and apparently form the upper division of the deposit. 
A red conglomerate, which is found between Apollona and Embona, 
dips 50° to the south-south-west, and rests conformably upon whitish- 
