Pace versus Trot: Can Medium Speed Gait Be Determined from Fossil Trackways?
نویسندگان
چکیده
Five camelid trackways from Arizona and New Mexico are described. Two trackways from the Bear Springs Badland (early Blancan) of Graham County, Arizona, represent a large camel, possibly Camelops or Megatylopus, and a medium-sized camel, possibly Hemiauchenia or Pleiolama. We also describe three camelid trackways from New Mexico. A medial Miocene (late Barstsovian) trackway from the Benavidez Ranch Local Fauna in Sandoval County represents a primitive, medium-sized camel, probably Protolabis. A late Miocene (early Hemphillian) trackway from the Gabaldon Fauna on the Isleta Pueblo in Valencia County is from a large camel possibly referable to the large lamine Alforjas. A late Pliocene (Blancan) trackway from the Cerros del Rio volcanic field near Santa Fe in Santa Fe County was made by a very large camel such as Gigantocamelus. The morphology for all five of these trackways fits within the definition of the ichnogenus Lamaichnum. We describe the characteristics of the trackways left by pacing and trotting camels and horses, and conclude that they can be differentiated in at least some cases in the fossil record.
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