Caribbean Journal of Earth Science, 38 (2005).

 

 

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.

 

Geological Society of Jamaica.