Post your folds, faults and fossils

[NoBob]

Having studied geology a long while back, I still have an interest in geology. Just wanted to see if anyone had any photos of geological subjects.

[Ole Tjugen]

I can't think of any I've shot with LF, except some high metamorphics.

I also studied geology a long time ago, but after a long sidetrack I am now back to reality and working as a geologist in the Norwegian oilfields. Since we have very very little sediments onshore here and all I see at work is the mangled bits that come up while drilling, at least I am absolutely sure that I have no LF photos of fossils.

Which of course is as good a reason as any to TAKE some?

[NoBob]

Can we see the metamorphic rocks?

[Ole Tjugen]

Okshornan, Senja, Troms, Norway.

film: 18x24cm Ilford FP4+
Camera: Gandolfi Precision 10x8"
Lens: Schneider Angulon 210mm f:6.8

[Heroique]

Here’s what geologists call a “glacial erratic” – sleeping in the mountains of N. Idaho.

It was carried here from Canada by a continental glacier during the last Ice Age, then abandoned like an unwanted child when the glacier went home. The glacier retreated perhaps 10,000 years ago – an eye blink in time in terms of deep-time geology. In all likelihood, the boulder’s rough-and-tumble journey sculpted it into this pleasing spherical shape.

I came across this granite boulder high up in the Bitterroot Mountains (Clearwater Nat’l Forest), along the same narrow ridge Lewis and Clark traveled twice – going West in 1805, and returning East in 1806. No doubt, they or one their party must have given it a curious glance.

Tachi 4x5
Schneider XL 110mm/5.6
Fuji Velvia-100F QuickLoad
Epson 4990/Epson Scan

[Robert Hughes]

There are similar round stone spheres in Costa Rica, far from any glacial event. Possibly man-made. Anybody know their story?

[austin granger]

I thought this was pretty interesting.

Cliff, Wildcat Beach, Point Reyes

[Ole Tjugen]

There are similar round stone spheres in Costa Rica, far from any glacial event. Possibly man-made. Anybody know their story?

Concentric weathering. Perfectly natural, and not uncommon. And no, it's not man made, nor does glaciation have anything to do with it except maybe in transporting the boulder to where it weathered.

[Heroique]

I thought this was pretty interesting.
Cliff, Wildcat Beach, Point Reyes.

That’s a pretty formation, Austin. Looks like a sunrise.

My educated guess – two chunks of sedimentary sandstone, where the top chunk has been turned perpendicular to the bottom one.

You can make out the successive, sedimentary layers in each.

[Ole Tjugen]

My guess - one sandstone (or maybe limestone) formation, and a giant S-fold. Look at the upper right, where the "flat" layers drape over the "eye". That's what makes me think it's only one formation.