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The staircase of raised beach ridges, over an altitude gain of about 100 m from present sea level, has formed in response to lithospheric rebound following melting of the Laurentide Icesheet. The present rate of uplift is about 1 m/100 years. Tukarak Island, Hudson Bay.
Belcher Islands, Hudson Bay

406 articles, atlases, and glossaries to choose from

Herein you will find posts on Earth and planetary sciences, Art and Science and other digressions that focus on Science Communication and online resources for students of all disciplines, but particularly Geology. Post categories-topics are linked to the navigation bar or just head to the latest additions listed below.

You can also use the Search tab at top-right of any page or post.

I do this for the love of it. I do not receive any remuneration for the site (and I don’t advertise). The website (geological-digressions.com) is not attached or beholden to any organization.

A number of colleagues have kindly donated images for certain categories of posts. They are all acknowledged, usually in the caption to an image. They are also acknowledged in a Contributors Page.

The How to… articles are designed for geology students, providing outlines of method and theory for some of the basic tasks that geologists undertake in the field and lab. They are directed primarily at beginning and undergraduate geology students and anyone else wanting a reminder or primer, and as such are a bit more technical than other posts.

Peruse the Atlas series for images of different geological environments and processes, modern and ancient.

The Glossaries have been compiled mostly from the article subjects in this website. Links to the relevant posts are included. There are currently 11 glossaries and about 3000 entries.

And finally, if you would like to know something about me, where I’ve come from, where I’ve been – A geological life

If you use any of the images on this website, please follow the normal protocols for attribution – for example: Brian Ricketts or Geological Digressions followed by the article link/URL.

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Conjugate fractures and en echelon tension gashes – indicators of brittle failure in Old Red Sandstone, Gougane Barra, County Cork, Ireland.
Mohr-Coulomb failure criteria
Stokes Law for particle settling in a schematic context of other fluid flow functions
Fluid flow: Stokes Law and particle settling
sandstone classification header
Classification of sandstones
Calcite cemented subarkose, Proterozoic Altyn Fm. southern Alberta
Sandstones in thin section
dip and strike compass
Measuring dip and strike
poles to bedding great circles
Stereographic projection – poles to planes
Recent Posts
Cam Potikohua lst thin section
Atlas of cool-water carbonate petrology
mary lyell portrait
Mary Lyell (1808-1873)
A classic topographic expression of resistant regressive sandstone cycles, each culminating in a maximum flooding surface in parasequences from the Jurassic Bowser Basin, northern British Columbia. The MFS in the foreground occurs just above the prominent bench where it is overlain by coarsening upward shale-sandstone of the succeeding regression. At least four such packages are present in this view (arrows indicate approximate MFS positions). Maximum regressive surfaces are also present below the MFS, as shown in the previous image. In each cycle, the transgressive package accounts for 10% or less of the total cycle thickness.
Atlas of sequence stratigraphy
Strand Fi glacier retreat-moraine
Glaciofluvial - periglacial deposits
Inge Lehman 1932
Inge Lehmann (1888 –1993)
nasa mackenzie_oli_2017200
Atlas of delta deposits
FD Strand Fi 83
Atlas of fan deltas
digitate Mavor stylolites
Stromatolites and microbial laminates
biped tracks
Atlas of trace fossils
Alta Dev-Miss east of Lewis Th
Atlas of Syntectonic sediments
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