Biology Reference
In-Depth Information
Figure 3.8
Magnetic polarities for the interval between 35 and 60 Ma, with North American
Land Mammal Ages. Compiled from various sources (for references, see Graham 1999, 103).
manatees, and land vertebrates such as the highly publicized dinosaurs,
their eggs, embryos, footprints, feathers in the avian progenitors, and cop-
rolites, that is, the fecal remains preserving, in turn, plant remains that
indicate the local vegetation and the animal's dietary preferences (fi g. 3.9;
Davis 2006). There are otoliths (fi sh ear bones; Surge and Walker 2005)
