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I posted a topic - Middle Devonian of Livingston County New York - recently and decided to include the other shelves in the display case. Also a fellow member requested to see more in the room so its their fault I had many more Oligocene fossils at one time and this is what I kept over the years (either I found it or it means something to me). Im sure there will be questions for me. Thanks, Mikeymig
Hi, there. I am seeking for help on an ongoing research. You see, there is two fossil sites in wich I work as a graduate student. We are developing a new method to identify isolated Bison teeth using multivariate statistics. Until now we beign able to differentiate between two ecotypes, a large form and a small form. These are not sexual differences (we alrealy test them and find the sexual difference does not correspond with our findings). The help I need now is if you know someone or directly posess skulls of fossil North American fossil bisons with attached teeth. I only need to identify your skulls and to measure all individual teeth. I currently use 5 variables and all I need is to measure them. Of course, I don't need you to send me the fossils or something like that, I just need you to measure them and send me close up pictures with a scale bar. The species I look for are Bison latifrons (giant bison) and Bison antiquus (ancient bison). I'm already seeking for museum's collections but they have few skulls with teeth on them. If know museums wich have a large number of them I appreciate you give me some info. This are the teeth I need to measure in the upper jaw. I'm also looking for some jaws that are associated with skulls in order to identify the species. This are the teeth I need to measure in the lower jaw. I will be very very thankfull if you can help me people. Thank you very much for reading. HAVE A NICE DAY.
The following data taken from Nowak's classic paper shows the difficulty of relying on size to identify fossils. Summary upper carnassial tooth length of canids: LP4 Canis dirus: 28.7 - 35.5 Canis lupus 22.2 - 30.5 Canis latrans 17.6 - 22.8 Canis familiaris 14.4 - 22.7 Canis armbrusteri 26.6 - 29.5 Canis edwardi 24.0 Canis lepophagus 19.0 - 20.7 In some cases (the fossils) the sample is small. In others, (lupus and latrans) it is more than 100 skulls. Coyotes overlap with wolves, and wolves overlap with Dire Wolves, but in each case, a significant portion of the individuals can be allocated to the correct taxon by size alone. Domestic dogs are a mess, as they overlap with both coyotes and wolves. When you throw in the remaining fossil canids, size ends up being pretty useless as the sole determiner of identity. Usually some knowledge of the geologic context can help eliminate some of the fossil taxa. This is an old data set, and I'll run a similar analysis of Tedford and Wang's data and post that later.