It's been a busy few days over at The Compact Thescelosaurus, with new alvarezsaurs, nodosaurs, and dryosaurs. For this post, I'm going to focus on Carpenter and Galton (2018), which not only describes new species Dryosaurus elderae, but also is quite important for previous subject Nanosaurus agilis, and in general ticks off several of my boxes anyway ("hypsilophodonts", Morrison Formation, National Park Service areas, etc.).
Sunday, August 26, 2018
Sunday, August 19, 2018
Plenty of name recognition as far as titanosaurs go in this post of "Your Friends The Titanosaurs", which features Argentinosaurus huinculensis as leading contender for the dinosaur heavyweight crown, Antarctosaurus wichmannianus as one of the most historically important and troublesome titanosaurs, and the somewhat less well-known but supremely steady Andesaurus delgadoi. Three questionable species of Antarctosaurus have been held over for next time.
Sunday, August 12, 2018
Following last week with Strophomena, and having figured out what seems to be a good method of photographing small specimens, I thought I'd try my hand at photo-documenting and identifying some trilobites. The sample set is mostly limited to the lower third to lower half of the Decorah Shale of St. Paul, and the most relevant publications for these trilobites are DeMott (1987) and Rice and Hedbloom (1987); Midwest Paleo also has a fine photo-atlas and list. I'm reasonably satisfied that my identifications at the family or subfamily level are accurate. Genus, I'm not so keen on. Species, I didn't even dare; I would be just parroting.
Sunday, August 5, 2018
Starting out in the Ordovician rocks of Minnesota and surrounding states, you run into a few kinds of fossils right away. Depending on the rocks you're looking at, these might include nut-like small brachiopods, fragments of branching bryozoans, ring-like or gear-like crinoid columnals, snail shells, conical horn corals and so on. Among the most noticeable of the common fossils are larger D-shaped shells, up to a few cm across. We've encountered these large shells a few times before in the Platteville and Decorah; they are the shells of brachiopods in the Order Strophomenida, one of the most abundant and diverse groups of brachiopods. To avoid any confusion with Strophomenida, Strophomenoidea, Strophomenidae, etc., and because we're all friends here, we'll just call these large shells "strophs". There are also smaller members of Strophomenida, but we'll leave them be for the present.