Saturday, February 9, 2008

Weekend fun - picture time!

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Everyone appears to be busy posting Geopuzzles, Friday Field Fotos 1 and 2 or Airliner Chronicles. Today I felt like posting something interesting to bother you with, too. Blogging is quite a long way down my lists of priorities, meaning I really got a lot of useful stuff done in the last days. Here is a foto of a sample outcropping right on my bookshelf. I am curious who can tell me what it is and how it forms. No need to write an essay though - we are not working here, right?!

So what do you see?

11 comments :

Ron Schott said...

I see a fantastic piece of doorstopite!

The Lost Geologist said...

It's my replacement doorstopite I have a better one close to the door. Of course there are different kinds of doorstopite.... :-)

Mel said...

Wow, that's a stumper for me. The layering is intriguing and it's seems like diagenesis has replaced/filled in what look like voids with coarser crystalline material. And since the rock hasn't fallen apart from the fracture and fault, I'm going to guess a carbonate rock, but I have no idea from what... Good puzzle.

The Lost Geologist said...

I am reading some good points there mel but it ain't quite it, yet. Carbonates sounds good though...

The Lost Geologist said...

BTW, mel, I took the freedom to add you to my Blogroll. :)

ringwald haze said...

Reminds me of the burrow-tracked, Ordovician-aged dolomite we have up here in Manitoba (known locally as 'tindelstone').

The Lost Geologist said...

There are no burrow-tracks or any other kind of bioturbation in this specimen. But it is dolomite...at least the white parts.

Silver Fox said...

It looks vaguely like a piece of Neguanee Iron Formation I used to have, but the white layers look like calcite infillings. The layers are offset in at least one place by a mini-extensional fault (on the right), in the center they are offset or disturbed by some unknown process.

Whew!

The Lost Geologist said...

So far no one got close. The only good clue so far is carbonate and dolomite. There is no iron here. If no one gets it I will give some more direct clues tomorrow. I didnt expect it to take so long.

GeologyJoe said...

Whatever it is, it looks delicious.

The Lost Geologist said...

Indeed it looks a bit like a nice piece of cake!