On the topic of the San Juan "Paleocene dinosaurs," I had occasion to ask Dr. Thomas Lehman, who knows a bit of San Juan stratigraphy, during my five year internment at Texas Tech. He indicated that this specimen has been known for a substantial period of time (it hasn't been news in years), and that the interval from which the specimen was recovered consists of several sandstone units "sandwiched" together into a thick section of sandstone. The precise correlation of particular sandstone beds to the laterally contiguous Maastrichtian and Paleocene deposits is not well understood. My recollection is that part of this sandstone sequence is correlative with Maastrichtian rocks. The upshot was that the specimen is stratigraphically indeterminate. Sorry folks.
P.S. Dan, missed you in Bozeman, man. You must go to Norman, Oklahoma... there you can meet Lehman, the Paleontologist who instructed me... ;)
Jonathan R. Wagner
9617 Great Hills Trail #1414
Austin, TX 78759