Geology of County Durham
Palaeogene
Palaeogene
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[Volcanism](/wiki/Volcanism "Volcanism") centred on western [Scotland](/wiki/Scotland "Scotland") took place during the [Palaeogene](/wiki/Palaeogene "Palaeogene") Period and resulted in the intrusion of innumerable dykes, one of which is the [Cleveland Dyke](/wiki/Cleveland_Dyke "Cleveland Dyke") which extends from [Galloway](/wiki/Galloway "Galloway") through County Durham to the [North York Moors](/wiki/North_York_Moors "North York Moors"). This intrusion of [basaltic andesite](/wiki/Basaltic_andesite "Basaltic andesite") which is up to 30m wide in places has been dated to 55\.8\+/\- 0\.9MaBGS p184


What are the implications of volcanism on local ecosystems during the Palaeogene Period?