#sedimentology

[geologicaltravels]

2025: Spectacular rippling in Ediacaran ABC Range Quartzite at Buneyroo Gorge, Flinders Ranges. As per usual, sunnies for scale.

[snototter]

An example of stromatolite, a layered sedimentary formation caused by photosynthetic bacteria. This example is around 2.2 billion years old.

by Bernard Dupont

[whoisandyloam]

[drrockclub]

Ripples from ~ 2-bilion-years ago

These ripples are preserved in this sandstone rock and are now lining a dry creek bed in Australian outback. But, it was around 2 billion years ago when motion of water formed these sand ripples on the bottom of a shallow sea. Note that orientation of ripples is different between sedimentary layers which indicates changes to water current direction.

[calciumcarbonater]

Here are some ripple marks from a beach in the Northwest Scottish Highlands! There’s a chance that these ripple marks will be preserved like this and become sedimentary structures that we can see as cross-bedding in an outcrop someday!

[susurrosvolcanicos]

[geologyjohnson]

New video!

There's new(ish) video up on youtube giving a quick guide to sandstones. This is the same video I uploaded last year, but I've cleaned the audio up so that you can actually hear what I'm saying now!

You can check it out below

[angstybreadstyx]

Some recent microscope photos! First two are sand and the eyeball lookin one is fossil sponge :)