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ICELAND – We spent Sunday morning discussing all of the features that we’ve seen during our reconnaissance investigations. After comparing notes, we defined several lithofacies, or mappable units with specific lithologic features. Our coherent lithofacies include pillow lavas, dikes, and intrusions while our fragmental lithofacies are units like volcanic breccia and lapilli tuff. By the [...]
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This picture is of a microfossil called a scolecondont (part of a worm jaw). It was found in the Waldron Shale of Clark County, Indiana, USA. The age is around 420 million years old which would place it in the Silurian Period.It reminds me of a Silurian scolecodont found in Sweden called Kettnerites sp. Also one found in New York called Nereidavus invisibilis. I have not been able to find much research on the ones found in the American Waldron Shale though.Thanks to Kenny for the picture.
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Note that 225-221 Ma is now considered to be Norian...
Blanchard, S., Rossignol, C., Bourquin, S., Dabard, M.-P., Hallot, E., Nalpas, T., Poujol, M., Battail, B., Jalil, N.-E., Steyer, J.-S., Vacant, R., Véran, M., Bercovici, A., Diez, J. B., Paquette, J.-L., Khenthavong, B. and Vongphamany, S. 2013. Late Triassic volcanic activity in South-East Asia: new stratigraphical, geochronological and paleontological evidence from the Luang Prabang Basin (Laos). Journal of Asian Earth Sciences
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LOGAN, UTAH–Today we hiked up part of Logan Canyon along the south side of the Logan River. Towering above us on either side were massive limestone cliffs, as shown above. The thickest unit is the Lodgepole Limestone Formation (Lower Carboniferous, Tournaisian — about 350 million years old), which is well known throughout the northern Rocky [...]
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I’m glad tomorrow is holiday. I need a break after today. Today I accomplished two major things: I mowed the lawn and I worked on my armor. The husband put together a very large and sturdy brooder to move the … Continue reading →
