地理essay範文_地质学代写_地理学代写

Snyder Hill Fieldtrip Report
Name
Institution

地质学代写 There are numerous Palaeozoic age outcrops spread in the southern part of Basin and Range province of Arizona. These rocks and fossils..

Snyder Hill Fieldtrip Report 地质学代写

Introduction

There are numerous Palaeozoic age outcrops spread in the southern part of Basin and Range province of Arizona. These rocks and fossils are a good source of geological research. Nonetheless, the rocks in the Permian in Southern Arizona are not well covered in geologic publications. An inquiry was needed to establish the type of fossils in Snyder Hill and their lithologic changes due to prevailing environmental conditions.

译文：

斯奈德山实地考察报告

介绍

盆地的南部和亚利桑那州的兰治省分布着许多古生代露头。 这些岩石和化石是地质研究的良好来源。 尽管如此，地质出版物并未很好地覆盖亚利桑那州南部二叠纪的岩石。 需要进行调查，以确定斯奈德山的化石类型以及由于普遍的环境条件而引起的岩性变化。

---

Purpose

A field study was conducted to acquaint the researchers with the types of fossils in the areas and at the same time be able to illustrate the various minerals and mode of their preservation in the three strata of the outcrop.

译文：

目的

进行了野外研究，以使研究人员熟悉该地区的化石类型，并同时能够说明露头三个层中的各种矿物及其保存方式。

---

Geography Setting and Description of Outcrop in the Snyder Hill 地质学代写

The outcrop is at the southwest of the Tucson Mountains and between State Highway 86 between Kinney Road and Ryan Field (Bryant 1955). According to Bryant (1955), the outcrop consisted of Concha limestone on the lower formation and the Rain valley Formation on the upper side that made a cliff of 15 by 20 meters. According to Bryant and McClymonds (1961),

the lower part was made up of limestone and chert rocks. The rocks were dark grey and mostly made of silica, limestone and dolomite. The outcrop had massive bedding of up to 1 meter. The area was relatively rich with well-preserved fossils including Brachiopods, Echinoids, Sponges, Crinoids, gastropods, bivalves, and bryozoans.

On the other hand, the middle part of the outcrop was 10 meters thick with a ledge formation. It had medium-thick bedding that mostly consisted of limestone and silica. The main types of rocks were limestone, chert, and siltstone, which made the whole part have a light grey colour. The rocks were fine and coarse.  地质学代写

译文：

斯奈德山露头的地理环境和描述

露头位于图森山脉的西南部，介于金尼路和赖安菲尔德之间的86号国道之间（布莱恩特，1955年）。根据布莱恩特（Bryant，1955年）的说法，露头由下部地层的Concha石灰石和上部地层的雨谷地层组成，形成15米×20米的悬崖。根据科比和麦克莱蒙兹（1961）的说法，

下部由石灰石和石组成。岩石为深灰色，主要由二氧化硅，石灰石和白云石组成。露头具有高达1米的巨大层理。该地区相对丰富，保存完好的化石包括腕足动物，棘突类动物，海绵，类海藻，腹足动物，双壳类和苔藓动物。

另一方面，露头的中间部分厚10米，有一个壁架。它有中等厚度的床上用品，主要由石灰石和二氧化硅组成。岩石的主要类型是石灰石，石和粉砂岩，这使整个部分呈浅灰色。岩石又细又粗。

---

The region is relatively rich with poorly preserved fossils including Brachiopods, 地质学代写

gastropods, brachiopods, sponge, and thoron nautiloid.The upper part is the Rain Valley. It forms a cliff with a thickness of about three by 5 meters. It has thin bedding and samples indicated that traces of minerals like limestone, dolomite and silica. The types of minerals showed the principal rock types were limestone,

dolomite and chert and together made the outcrop part look light grey or brownish. The rocks were also coarse. There were few types of lowly preserved fossils in this part included echinoids, brachiopods, gastropods.Geological Setting Through Time and Regional Geology

The climatic conditions of deposition were warm tropical marine conditions (Rasmussen 2012). Evidence for the marine environment comes from organisms like sea urchins that only occur in marine environments. On the other hand, evidence for the warm tropical climate comes from limestone which is found throughout the outcropping limestone today mostly form in tropical seas. 地质学代写

译文：

该地区相对较丰富，化石保存不佳，包括腕足动物