17.07.2021 | History

5 edition of Geology on Your Doorstep found in the catalog.

Geology on Your Doorstep

The Role of Urban Geology in Earth Heritage Conservation

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Published by Administrator in Geological Society of London

    Places:
  • United States
    • Subjects:
    • Geological Society of London


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      • nodata

        StatementGeological Society of London
        PublishersGeological Society of London
        Classifications
        LC ClassificationsApril 1996
        The Physical Object
        Paginationxvi, 124 p. :
        Number of Pages88
        ID Numbers
        ISBN 101897799543
        Series
        1nodata
        2
        3

        nodata File Size: 2MB.


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Because of subsequent erosion each terrace occurs as patchy remnants. England, Scotland and even Scandinavia. It is a shallow sea deposit at the base, but upper parts were deposited by rivers flowing eastwards across the area.

It is divided into Lower, Middle and Upper parts by two layers 5-10 ft thick, which are harder than most of the remainder. The sea in which it accumulated was much deeper and clearer, with almost no mud from the land. Interglacial deposits were mainly formed in small lakes or streams, and are therefore even more localised in occurrence.

Introduction To The Geology Of Hertfordshire

It is a very hard material, which has has been used as building stone, mainly for facing external walls of churches and houses throughout the county. After deposition of the Reading Beds there was a further cycle of uplift, tilting, erosion and then subsidence of the land beneath the sea. An interesting hard rock material sometimes found in the Reading Beds is Hertfordshire Puddingstone see examples and posters relating to this on the stall.

1about 100 million years old. Southward overflow from the lake formed a new course, which developed into the present Thames valley through Middlesex Geology on Your Doorstep central London.

Introduction To The Geology Of Hertfordshire

The Gault Clay is composed mainly of fine mud brought into the Upper Cretaceous sea from surrounding land areas by rivers. Examples of Reading Beds outliers occur in northern parts of St. In contrast, the Chalk is composed almost entirely of calcium carbonate accumulated by microscopic marine organisms, especially planktonic algae.

In south-eastern Hertfordshire the Chalk is about 680 ft thick.