Showing posts with label bioturbation. Show all posts
Showing posts with label bioturbation. Show all posts

Monday, June 27, 2011

Accretionary Wedge #35: My Favorite Word

I've been racking my brain to think of my favorite geology word. Thing is, geology is a great science for people who like words. We've got all sorts of words.

But, I think I'm going to have to go with "bioturbated" for my wedge post. It's got lots of great implications. In the geologic sense, "bioturbation" occurs when living organisms burrow/crawl/move through sediments, thereby disturbing whatever primary structures were present. I mentioned it last year, too.

I particularly like reference to one particular type of bioturbation. Dinosaur footprints. These prints can sometimes be found all over in Mesozoic rocks - enough of them that it is sometimes referred to as "Dinoturbation."

SanRaph_8669
Iguanodontid footprints - click to embiggen.

Of course, bioturbation need not be preserved in rock to be interesting. Gophers and moles are excellent bioturbators:
Burrow_5556

Perhaps some day in the distant future our descendants (or the sentient offspring of some surviving taxonomic group) will have their version of geologists. If the term survives, these geologists might mark the tiny sliver of geologic time that some refer to as the "Anthropocene" by noting extensive bioturbation due to activities by a particularly industrious species of ape. We may not be the most extensive agents of bioturbation in Earth history, but we're doing a pretty good job.

UPDATE: Just noticed that this was my 300th post. I don't know if there's anything special, but I kind of like the idea that this reaches the even century mark for the 3rd time.

Monday, October 04, 2010

Howdy!

Judging by the spike in my visitor counts, Brian Romans' post of my braided river image has gone up.

For those of you that are new, welcome. Feel free to poke around. In other news, here's a picture for your entertainment:



Those of us that study the variety of processes that occur at or near Earth's surface, we sometimes have to account for the fact that living organisms often call this thin veneer of fragmented rock, organic debris, air, and water home. As they go about their lives, they often churn up these layers of meticulously deposited material. When viewed from the perspective of a geologist, we call it "bioturbation." When viewed from the perspective of a groundskeeper, it's called a "varmint." Technically speaking, it was probably a ground squirrel or a mole, not a gopher 'round these parts.


"Well, here we are! Pismo Beach and all the clams we can eat!"



"Hey, wait a minute! Since when is Pismo Beach inside a cave?"


I arrived at school one Monday morning to find this lovely tunnel lying exposed in the newly graded front "yard" of our newly renovated science building. I took a few pictures - the whole plot was smoothed over and seeded by the grounds crew before I could find a toy Bugs Bunny and Daffy Duck to place in the photo...

...it must have been that left turn near Albuquerque.