FMARS Sponsors	Geology Report - July 20, 2005 Tiziana Trabucchi Reporting Description: Laboratory Day 1 Narrative: Today I spent some time in the laboratory observing the samples with the diamond loupe in grazing light. I washed a few samples and brushed the rest. Then with HCl, I tested which part was dolomite and which part was calcite. For the presumed sponge Jon Clarke from the RST indicated most sponges belong to the silicieous classes of Demospongia or Hexactnalidia, many have a solid rock like skeleton and are called Lithistids -- so this is a strong possibility. This sample doesn't have calcite in any part. There are two rock samples that are showing lineations, and examinated with the loupe those lineations looks like they are due to the original shape of corallite, and presents micropores, so is not a bottom moraine. The single coral presents one insertion track, like it has been a twinned coral. We have three little fragments that show an internal structure of probable tabulae, so it could be a diagonal section of coralline colony. There is one fragment, a longitudinal section, that looks like a crinoid columnalia but could be also an Archaeocyatha. Return to Daily Index Page
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