File:YGS CHR 01 REGI FIG 03.jpg

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English: Figure 3 Mid-Devonian. Closure of the Iapetus Ocean resulted in the creation of a large Devonian (Old Red Sandstone) continent that covered eastern Laurentia–Greenland and modern Scandinavia. Scotland and England were united. Through the middle of the main Caledonian mountain range, the approximate location of parts of the Iapetus Suture can be deduced from the occurrence of intermontane basins containing both fluvial and lacustrine sedimentary sequences. Mid-Devonian marine limestones extended from the Rheic Ocean far into that continental area, suggestive of a northwest–southeast trending tensional gash orthogonal to the sharp bend in the Iapetus Suture seen so clearly on (Figure 2) and which possibly is also connected with the suture of the old Tornquist Sea. An active west–east trending Hercynian (Variscan) Fold Belt was developing south of the Rheic Ocean. Britain was still south of the Equator during the Devonian. Modified from Ziegler (1987).
From: Carboniferous hydrocarbon resources: the southern North Sea and surrounding onshore areas, edited by J. D. Collinson, D. J. Evans, D. W. Holliday, N. S. Jones. Published as volume 7 in the Occasional Publications series of the Yorkshire Geological Society , Copyright Yorkshire Geological Society 2005.
source Yorkshire Geological Society
author K. W. Glennie

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Northumbrian rocks and landscape

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Carboniferous hydrocarbon resources: the southern North Sea and surrounding onshore areas

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Attribution statement: Image from 'Carboniferous hydrocarbon geology.' Yorkshire Geological Society 2005. www.yorksgeolsoc.org.uk

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