TS
Tectonics and Structural Geology

Outcrop

Features from the Field: Dikes and Sills

and May 30, 2022
dyke and sill in Dalradian quartzite
Dikes and sills intruding Dalradian quartzites, Donegal, Ireland. Photo © Prof. Alan Cooper (University of Otago).

Volcanoes are everywhere along plate margins and on hot spots on the planet’s surface. Just in the past 2 years, we have witnessed enormous explosive eruptions such as that of the Hunga Tonga volcano which released an amount of energy equivalent to hundreds of atomic bombs, and massive lava flows, as at the Cumbre Vieja at La Palma, which was estimated to have a total volume of 80 million cubic me ...[Read More]

The Netherlands: In search of the oldest rocks of a muddy country

June 17, 2019
The Netherlands: In search of the oldest rocks of a muddy country
The flat countryside of the Netherlands. Credit: Anne Pluymakers

Technically speaking, the Netherlands isn’t really a city, even though it is the most densely populated country in the European Union and one of the most densely populated countries in the world, with 488 people/km­2. It is a delta, and for many people geology is not the first thing that springs to mind when thinking about the flat countryside. Large parts of the country have been more often below ...[Read More]