What are some of the Erosional and Depositional features found at Manchioneal?
Table of Contents
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To investigate and illustrate some of the erosional and depositional features in the town Manchioneal, Portland.
Introduction of study area
Manchioneal is a small town, located in the parish of Portland(capital is Port Antonio). It is located on Jamaica’s northeast coast, with its geographical coordinates 18⁰ 2’ 0”North, 76⁰ 17’ 0” West. Products such as Bananas and Coconuts are produced in Manchioneal, also, Manchioneal consist of many beautiful depositional and erosional features which give it a unique look, which made it a tourist attraction.
On May 7,2010 at approximately 8:30am, a group of geology students of Merl Grove High School went on a field trip. The field exercise was conducted along the coastline. The area studied for the S.B.A was Manchioneal, Portland.
The data were collected in various ways such as: A Sketch was made of an Arch. A diagram of Erosional features along Portland road was drawn. Photographs were taken of features such as stack, Blow hole, Beach and Cave. Field notes were also made and textbooks were used to collect secondary data.
A Cave is a large, naturally-occurring cavity formed in the face of a headland. The cave in Fig1. was seen in Manchioneal , Portland. It is a result of erosion along joints by corrosion and hydraulic action due to the attack of waves on the weakness in the headland. Wave erosion attacked the headland along a line of weakness to form a notch. Wave action further enlarges the notch to form a cave.
Fig. 1. A picture of a cave in Manchioneal , Portland.
A disastrous hurricane, Dean, threatened the island of Jamaica in the year of 2007. It caused damages in some parishes, Portland , which is on the Northeast coast was included. The Arch in Fig.2 was a result of this hurricane .This arch was developed along a huge headland, when breaking waves which curved on the headland due to refraction, attacked weak lines and joints on both sides of the headland. Caves were formed on both sides of the narrow headland and were vertically eroded to form this Arch.
Fig2. Diagram of an Arch in Manchioneal, Portland.
Stacks are easy to recognize because they stand alone, no longer attached to the cliffs. They are usually tall rocks rising from the sea just off the shore. The stack in Fig.3 was seen in Manchioneal, Portland. This was form when a line of weakness was exposed in the headland. This Arch was a result of further erosion of a headland with a collapsed arch, leaving the seaward part of the headland as an isolated stack. The cave was extended by wave action until they ran through an exposed headland. The cave became a natural arch. The roof of the arch joins the headland to the shore. The roof of the arch collapsed, into the isolated sea stack....
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