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Links to interesting videos illustrating some of the organisms and processes related to this chapter, updated on a regular basis
Falcatus and Other Fossil Chondrichthyans of Bear Gulch
http://people.sju.edu/~egrogan/BearGulch/pages_fish_species/species_list.html
Chondrichthyes: Fossil Record
http://www.ucmp.berkeley.edu/vertebrates/basalfish/chondrofr.html