Image: Garthna Geo composite dyke
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Description: A composite dyke at Garthna Geo, Orkney, Scotland, with bostonite (syenitic) margins and a camptonite centre cutting Devonian age Harra Ebb sediments. The dyke has been dated to 313±4 Ma, Late Carboniferous, see [1]
Title: Garthna Geo composite dyke
Credit: Own work
Author: Mikenorton
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: https://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes
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