Advertisement

You are browsing the archive for scotland Archives - Mountain Beltway.

20 May 2019

Digital manipulation as a teaching aid

Photoshop is a powerful image editing program. Its “cloning” tool allows the removal of “distracting” data from geological imagery. Examine these four examples and consider the ethical limits of the technique. Is it okay to remove fractures and lichens from an outcrop photo in order to allow novices to focus on the geological content you want them to learn from?

Read More >>

11 Comments/Trackbacks >>


6 February 2019

Dalradian schist at Glen Roy

We saw last week how glaciation carved out a valley in Scotland called Glen Roy. As the glacier ground into the landscape, it liberated tremendous numbers of sedimentary particles from the bedrock, which is composed of Dalradian metamorphic rocks (mainly porphyroblastic schist in my observation). Then once that now-U-shaped valley had been deglaciated, a new glacier dammed it, making a lake that rose and filled the declivity of Glen Roy, …

Read More >>

No Comments/Trackbacks >>


29 January 2019

The Parallel Roads of Glen Roy

What can we learn from Scotland’s Parallel Roads of Glen Roy?

Read More >>

4 Comments/Trackbacks >>


22 August 2018

Q&A, episode 5

A reader asks: “What is foliation and what makes it so important to the structure of rock?”
Callan answers with a lot of images of beautifully foliated rocks.

Read More >>

4 Comments/Trackbacks >>


1 March 2018

A GIGAmacro view of a cool outcrop in Scotland

As noted previously, the old way of viewing gigapixel imagery is no more. But there is a new, better way. The GIGAmacro company has a better viewing platform that can be used either with images uploaded to their server or  with pre-existing images that currently “live” at GigaPan.com. Here’s an example: a roadcut of limestone of the Grudaidh Formation (Durness Group) in the Northwest Highlands of Scotland, near Ardvreck Castle, …

Read More >>

2 Comments/Trackbacks >>


9 August 2017

A suite of new 3D models

A showcase of five new 3D digital models of awesome rock samples and outcrops, produced using Agisoft Photoscan.

Read More >>

No Comments/Trackbacks >>


3 May 2017

Storm beaches have I loved

The answer to yesterday’s geo-puzzle is revealed to be a storm deposit of boulders, 20 m above sea level!

Read More >>

No Comments/Trackbacks >>


12 April 2017

Weathering along perpendicular joint sets, Arran

Check this out: That’s a beautiful example of weathering in a dolerite dike on Arran. The igneous rock was broken along two more or less perpendicular joint sets, and then fluid flow along those fractures helped “rot” the adjacent rock through oxidation and hydrolysis. The resulting brownish weathering rind  grows at the expense of the unweathered black rock. Because there is more surface area at the corners of the rock …

Read More >>

No Comments/Trackbacks >>


6 April 2017

Stac Fada

The evidence for a meteorite impact origin for the Stoer Group’s Stac Fada member seems to stack up. Engage in a virtual field investigation on Mountain Beltway.

Read More >>

No Comments/Trackbacks >>


9 March 2017

Lugworm casts on the beach, Islay

Who dwells beneath the sands of Islay? Lugworms do. These embedded annelids process the sediment for food, extruding the undigested sand in charismatic piles that adorn the beach of Loch Gruinart.

Read More >>

No Comments/Trackbacks >>