The Grampian Terrane has basement rocks about 1800 million years old (Badenoch group and Rhinns Complex) buried under the Proterozoic rocks of the Dalradian supergroup on the mainland and its equivalent rocks in the Inner Hebrides (Colonsay). These were deposited as sediments around 900-500 million years ago, resulting from erosion of various sources across Laurentia and were later metamosphosed. A record of dramatic climate changes and the expanding sea floor of the Iapetus Ocean are preserved in two key formations of the Argyll group.
The Paleozoic era brought the opening and closure of the Iapetus Ocean that was accompanied by two episodes of magmatic intrusions (Older Granites and Newer Granites). A complex of igneous and sedimentary rocks, of which now only a narrow discontinuous strip remains, preserves a segment of oceanic crust formed during the opening of Iapetus and emplaced onto the continental crust during its closure (the Highland Border Complex). Deposition of the Old Red Sandstone supergroup is confined to the Highland Boundary Fault and the Kintyre Peninsula, the West Highlands, the Inner Hebdrides and the Orcadian Basin. The Mesozoic and Cenozoic eras are not represented significantly in stratigraphic records.
This informal short course over 6 weeks provides a chronological overview of the formation and deposition of major rock groups from about 3000 million years to 50 million years ago, from Scotland’s oldest rocks to the young volcanic districts of the Hebrides. It will be presented online by Dr Alex G. Neches and guest contributors.
Free, booking essential: https://us02web.zoom.us/meeting/register/tZEvfu-qrj8vHdM8uj1Y0ijwFGG7pmdBz-6S
After registering, you will receive a confirmation email containing information about joining the meeting.