According to the passage, one of the reasons for the deficiencies of the "early classification of Alpine glaciations" is that it was A. derived from evidence that was only tangentially related to times of actual glaciation B. based primarily on fossil remains rather than on actual living organisms C. an abstract, imaginative scheme of how the period might have been structured D. based on unmethodical examinations of randomly chosen glacial biological remains E. derived from evidence that had been haphazardly gathered from glacial deposits and inaccurately evaluated