Friday, April 19, 2019

041919



Two examples of dedolomite (dolomite that has been dissolved) from the Jurassic Smackover Formation in Alabama. In the first image, some dolomite crystals are hollow. Blue indicates open pore space. In the second image, hollow dolomite crystals have been filled by calcite cement (pink, stained by Alizarin red S). These samples come from rocks buried several miles below the surface. Thin section photomicrographs, 1 mm across.

Thursday, April 18, 2019

041819b



octopi
boiled out of the hatches
when the mate bellowed
"all hands on deck"

041819


Grainstone composed almost exclusively of Parafavreina, a fecal pellet made by burrowing shrimp. This deposit is almost identical to modern accumulations of fecal pellets made by related burrowing-shrimp.This thin section was stained with Alizarin red S, staining calcite pink. White particles are quartz silt grains.. Light pink areas are calcite cement crystals filling original open spaces among the pellets. Jurassic Smackover Formation, Alabama, image 2.5 mm wide.

The photos of Parafavreina that I have been posting were taken in the process of preparing this scientific article:

Rindsberg, A. K., and Kopaska-Merkel, D. C., 2013 , Parafavreina ziczac isp. nov., a crustacean microcoprolite from the Upper Jurassic (Oxfordian) Smackover Formation of Alabama, U.S.A., Alabama Museum of Natural History Bulletin 31, v. 2. p. 74-93.

I have PDF copies of the article if anyone is interested.

Wednesday, April 17, 2019

041719d


Dolomite (gray) partially replacing calcite (pink) in a mixed-particle grainstone cemented with marine cement crystals (light pink). Particle in the center is a shrimp fecal pellet. 13,000 feet below the surface, Jurassic Smackover Formation, thin section photomicrograph, field of view 2.5 mm wide

041719c


Too much growth hormone I guess
then again
it could be something with the weather
or aliens

Farmer Brown surveyed
the apple that had landed
on his barn
and the lake of apple juice
surrounding it

horse with applesauce might be good
he thought
have to get the wood out
somehow though

041719b


the pilot lay dying
nurse lobster helplessly clacked
her chelae

041719


This arcane device
apparently used to scratch religious statements and exhortations
into walls
has the amusing name
of "ottle opene"
our linguists still puzzle
over its meaning