Page 15 - Maldonado_Stanley_1976

12 SMITHSONIAN CONTRIBUTIONS TO THE EARTH SCIENCES
l
WEST EAST
--- km 110
k~-~ _J_ -
~t-.. -

o 4
n , n km

Northeast Extension of Galite Archipelagol
WEST EAST
km 1017 km 955

500 fml

FIGURE 6.-Selected 3.5 kHz and sparker records of neritic-bathyal environments: A, Outer margin,
faulted at eastern end of the Strait; note reduced sediment cover on the 3.5 kHz record. B 1
(sparker) and B 2 (3.5 kHz), Across the northeast extension of Galite archipelago (arrows denote
marked topographic high (? volcano, B); note reduced sediment cover). c, South Sicily Medina
Uplift, Jeffara-Malta axis, showing some sediment in contrast to A; steps and other topographic
breaks are almost certainly fault-controlled.

tures are also observed 1n this environment (cf. 1800 m per second is assigned to these unconsoli-
Figure 3). dated Pliocene-Quaternary sequences (Finetti and
The thickness of the Pliocene-Quaternary sedi- Morelli, 1972a, b), we estimate a sediment thick-
ment section recorded on sparker profiles is highly ness which ranges from O to about 650 m.
variable. An average of 0.4 seconds (or 360 m, two- Cores collected in this neritic-bathyal platform
way travel time) is generally present throughout environment (LY II-4, KS 105) and those from
the area; it thickens to 0.7 seconds (630 m) in the the zone of transition to the next environment
axis of the depressions (Figure 7, arrow b) an d is ("Neritic-Bathyal Depression" environment dis-
reduced or absent on mounts. If a velocity of about cussed in the following section) (LY II-64, KS 78,