Displacement Along The Highland Boundary Fault
It is currently believed that there were two main displacement events along the Highland Boundary Fault: the Acadian, and the post-Acadian.
Evidence for the Acadian displacement event is based on the geochemical study of detrital garnets in the Lower Old Red Sandstone on the Northern limb of the Strathmore Basin. These garnets were linked to those in isolated Dalradian sediments in the North-West, providing evidence for post-Early Devonian (Acadian) movement to be only few tens of kilometers.
In addition, the Lintrathen ignimbrite, which is present at the base of the Lower Devonian sequence was traced along the fault and it was found that the displacement was both short and lateral.
The post-Acadian movements are highlighted in the stratigraphy of the region. The Lower Old Red Sandstone is unconformably overlain by Upper Old Red Sandstone, where the Upper Old Red Sandstone is tilted close to the Highland Boundary Fault.
Read more about this topic: Highland Boundary Fault
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