November 7, 2017
I tagged this photograph with “lichen,” but I’m not really certain that the white marks on the large rock are lichens. What else could they be? Fossils in the stone?
Later in the Day
Scientist-husband David suggests “mineralized inclusions in the rock. Could be of biological or abiotic origin from what little I can see.”
We now have two more opinions favoring the lichen theory: One is from my husband’s colleague in the Oberlin College Department of Biology, and one is from Art Murphy, who usually knows a fossil when he sees one. (See Art and Fossils.)
November 6, 2017
November 5, 2017
Now that we’ve moved back to Oberlin, I don’t go to Schoepfle Garden as often as I used to when it was a half-hour’s walk from home. I was there twice last month, though. I love to get there early.
October 10, 2017
October 9, 2017
October 8, 2017
October 7, 2017
October 6, 2017
October 5, 2017
If you’re new to this blog and want to know more about the iron-breathing bacterium called Leptothrix discophora, please see this FAQ.
October 4, 2017
The small patch of Leptothrix discophora film in the bottom left of this photograph gives you a taste of the run of images that starts tomorrow on this blog.