File:The Humber Stone - Glacial Erratic - geograph.org.uk - 2239467.jpg

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The_Humber_Stone_-_Glacial_Erratic_-_geograph.org.uk_-_2239467.jpg ‎(800 × 531 pixels, file size: 127 KB, MIME type: image/jpeg)

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English: The Humber Stone - Glacial Erratic, near to Thurmaston, Leicestershire, Great Britain.

The Humber Stone is a syenite glacial erratic brought here by ice between 478,000 and 424,000 years ago during the Anglian stage glaciation. Its original location was the Mountsorrel intrusions a few miles north; you can see the chimney of the quarry works from this site.

The syenite is a granitic rock, formed when the Tornquist sea closed not long before the Caledonian Orogeny during the Ordovician/Silurian. A subduction zone was sited under the north sea with Avalonia being subducted and later colliding with Baltica. This produced a line of volcanic intrusions deep down running from the Lake District right down to here and even East Anglia. There is magnetic evidence for a pluton underneath the Wash.

It is sited next to a roundabout on the Leicester outer ring road, it is signed and has an information board.
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Source From geograph.org.uk; transferred by User:Rubberstamp using geograph_org2commons.
Author Ashley Dace
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(Reusing this file)		 Creative Commons Attribution Share-alike license 2.0
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Ashley Dace / The Humber Stone - Glacial Erratic / 
CC BY-SA 2.0
Ashley Dace / The Humber Stone - Glacial Erratic
Camera location52° 39′ 27.67″ N, 1° 04′ 45.18″ W  Heading=22° Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo
Object location52° 39′ 29″ N, 1° 04′ 44″ W  Heading=22° Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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Attribution: Ashley Dace
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