Triassic Meteorite Impact Deposit
Collection:
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Microscope
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Object

Fact sheet

Triassic Meteorite Impact Deposit

This sample is part of a Late Triassic Meteorite impact deposit in SW England. This deposit found near Bristol appears to indicate that Britain was showered with a fine layer of debris from an asteroid impact at the Manicouagan Impact Crater in Canada. The deposit was probably an ephemeral lake in an arid environment and is not extensive. It is thus a protected locality but we are able to include this virtual rock in our collection of British meteorites.

The rock is one of only two pieces of evidence that meteorites have been falling on the Britain over geological time. The other deposit, at Stac Fada in Scotland is Proterozoic in age.

The rock contains shocked quartz grains, and a range of other broken and shocked minerals and remnant glass. The prominent green balls are clay remnants of glass spheres that were altered soon after they formed. The rock is cemented by a form of K-feldspar known as adularia, and this has helped pin point the age using Ar-Ar dating. 

Additional images
Map
51.484804, -2.537842
Description:
SW England
Precision:
Moderate
About this collection

The United Kingdom Virtual Microscope (UKVM) collection consists of igneous, sedimentary and metamorphic rocks from around the UK.

It is intended as a teaching resource, helping to tell the story of the common rock types and how they form, and reflecting the history of the UK at the margins of the continent of Europe. The collection is a series of teaching sets, for example igneous rocks from the North Atlantic Igneous province, and SW England; high temperature metamorphic rocks from Scotland and low temperature metamorphic rocks from Wales; and sedimentary rocks including English limestones and sandstones.

Sample details

Type
sedimentary
Rock forming mineral
quartz
Category guide  
Category Guide
Title
Refers to any word or phrase that appears in the individual rock names. Names are generally descriptive; they allow the user to searranite' as well as more speci?c names such as 'breccia'. However, the adjacent descriptiix captures a wider range of general words and phrases and is a more powerful search tool.
Description
Refers to any word or phrase that appears anywhere in the descriptions of the specimens
Accessory minerals
Minerals that occur in very low abundance in a rock. They are usually not visible with the naked eye and contribute perhapssver, they often dominate the rare elements such as platinum group metals.
Rock-forming minerals
Minerals that make up the bulk of all rock samples and are also the ones used in rock classi?cation.
Timescale
Selecting one or more period, for example 'Jurassic'.
Theme
A term used to group togge.g. the UKVM contains a 'SW England granites' theme that includes such rock types as granite, hydrothermal breccia, skarn, and vein samples).
Category
A general term used to label a rock sample. It is a useful way of grouping similar samples throughout a collection. Category names are often, but not exclusively, common rock names (e.g. granite, basalt, dolerite, gabbro, greisen, skarn, gneiss, amphibolite, limestone, sandstone).
Owner
The owner of the sample that appears in the collection. For example, NASA owns all the samples that appear in the Moon Rocks collection
We would like to thank the following for the use of this sample: