Holyrood Park image - Deep Time Walk

Deep Time Walk at the Science Festival

Holyrood Park image - Deep Time Walk

Deep Time Walk at the Science Festival – Thursday 11, Saturday 13 and Monday 15 April 2019

The Edinburgh Geological Society is delighted to be contributing to this year’s Science Festival with a unique event in Holyrood Park, exploring deep time, in association with the team behind the award-winning Deep Time Walk mobile app. Join us in the Deep Time Walk to travel across Earth’s 4.6 billion year timeline at a rate of one million years per metre. Starting at the creation of Earth, the walk covers significant events in history, including the formation of the Moon, plate tectonics, the early evolution of life, dinosaurs and much more.

Download the award-winning Deep Time Walk app at deeptimewalk.org.

Full details and tickets – www.sciencefestival.co.uk/event-details/deep-time-walk

 

Central Scotland Regional Group of the Geological Society

The Central Scotland Regional Group of the Geological Society organises regular events at various locations in Glasgow and Edinburgh. All event details are available on their web page. Meetings generally start at 6:15pm with tea and coffee from 5:30pm. All welcome.

The next event is a lecture by Mark Hudson on Sub-surface Laser Scanning, Multi Beam Sonar Surveys & Void Surveys
Date: 12 February 2019
Venue: Edinburgh Centre for Carbon Innovation

Mark Hudson presents on recent developments in sub-surface scanning and void surveys including ongoing research and development in the area, Mark will draw on his many years of experience in investigation of underground voids with numerous case studies from the UK.

Should you have missed or are not able to attend one of the CSRG events, presentations can be found on the past meeting resources webpage or their YouTube channel.

Evidence of a large explosive silicic eruption on Skye

An article recently published in Nature Communications has suggested a connection between the Sgúrr of Eigg and a distant rocky outcrop Òigh-sgeir, with a major volcanic eruption on the island of Skye and a significant climate event 55 million years ago, the Palaeocene-Eocene Thermal Maximum (PETM).

Valentine R. Troll et al compared mineralogy and isotope geochemistry of the pitchstone on Eigg and Òigh-sgeir, and the results suggest that the two outcrops represent a single, pyroclastic deposit. Prior to this study, David Brown and Brian Bell (in a paper published in 2013) had suggested a connection between the outcrops and an volcanic eruption on Skye – the new paper confirms these results and proposes a connection with the PETM.

The magnitude of the Skye volcanic eruption was estimated to 3.9- 15 km3 DRE (dense-rock equivalent) and a 5-6 on the Volcanic Explosivity Index scale, which compares with historical examples such as the 1991 Pinatubo eruption ( ~ 5 km3 DRE). The results imply that large-scale explosive silicic eruptions have likely been common during the opening of the North Atlantic. This paints a more violent picture of the rift to drift transition of the North-Atlantic region between 61 and 56 million years ago than previously assumed.

Source and run-out distances of the proposed Skye volcanic event, Troll et al. 2019

You can read more about the Sgúrr of Eigg and different ideas proposed in the past to explain its formation by some of Scotland’s well-known geologists (including Hugh Miller and Archibald Geikie) in the Geology of Eigg (2016), by John D Hudson, Angus D Miller and Ann Allwright, published by the Edinburgh Geological Society.

Valentin R. Troll, C. Henry Emeleus, Graeme R. Nicoll, Tobias Mattsson, Robert M. Ellam, Colin H. Donaldson & Chris Harris: “A large explosive silicic eruption in the British Palaeogene Igneous Province”. Scientific Reports volume 9, Article number: 494 (2019) Published in Nature https://www.nature.com/articles/s41598-018-35855-w

A summary of the article was included in the BBC news website https://www.bbc.co.uk/news/uk-scotland-highlands-islands-46986509

The original article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format. Creative Commons licencing http://creativecommons.org/licenses/by/4.0/