The
lithostratigraphy of the Maldon Inlier, parish of St. James, northwestern Jamaica
Gavin C. Gunter and Simon F. Mitchell
Abstract. Formal lithostratigraphic units
are herein erected for the Upper Cretaceous succession of the Maldon Inlier,
parish of St. James, Jamaica. The lithostratigraphic
nomenclature of the Maldon Inlier is reviewed and clarified. New units have
been recognized during a re-mapping exercise and these are described. The
Woodlands, Maldon (inclusive of Shaw Castle Member), Popkin (inclusive of newly
described Abingdon, Tangle
River and Banana Ground
members), Vaughansfield and Flamstead formations are herein recognised.
Mapping landslide
susceptibility for the Caribbean island
of Tobago using GIS,
multi-criteria evaluation techniques with a varied weighted approach
Serwan
M. J. Baban and Kamal J. Sant
ABSTRACT.
A GIS based methodology for evaluating landslide susceptibility for the
Caribbean island
of Tobago using GIS,
multi-criteria evaluation techniques with a varied weighted approach using
Boolean overlay is presented. The degree of susceptibility was weighted based
on the prevalence of the condition of aspect, geology and slope in terms of
acreage. The outcomes are presented as low, medium, high and severe
susceptibility of areas to landslides. The areas to the south and west of Tobago were of either low or medium susceptibility to
landslides. The northeast facing slopes along the Main Ridge of Tobago were of
severe susceptibility. The outcomes are compared to previous research using an
even weighted approach on landslides. The largest difference occurred in the medium
susceptibility range followed by the high, low and severe ranges. In both
cases, the susceptibility increased from the southwest part of the island of Tobago towards the Main Ridge area and
the north-eastern part of the island. The landslide susceptibility map produced
is a valuable tool, providing a basis for conducting detailed site-specific
investigation on areas with high and severe susceptibility to landslides, which
already have or plan to have infrastructure development.
The geology of Barbados:
a field guide
Stephen
K. Donovan (including a joint contribution with David A.T. Harper)
Aerial photographs
for detecting land use changes in Valencia
Wildlife Sanctuary and Forest Reserve, Trinidad
Raid Al-Tahir, Farah Rajack and Mike Oatham
ABSTRACT.
The vast potential for negative impacts of land use change upon the environment
has created an urgent need for the creation of a comprehensive view of land
cover/use change. Such a perspective would serve as an invaluable tool that
could be used by public administrators and environmental managers to manage the
rate of change in land use in forested areas. Presently, the timing and extent
of the changes in land use in the Valencia forest are not accurately
known. Examination of the extent, trends, and time of land use change, and
patterns within the forest, will assist land managers in understanding human
impacts, and in formulating future management decisions. This paper develops a
methodology that promotes the use of archival aerial photographs for mapping
and quantifying the change in land use patterns in the Valencia
forest. By using available aerial photographs of 1969 and 1994, it was found
that there was an increase in area for every land use category in the forest
reserve on the account of natural forest that showed a drastic decrease in land
area. Fragmented forest had exhibited the largest increase in land area while
abandoned agriculture showed the smallest increase in land area within the
Reserve.