In geology, and probably in all lines of research, there is a tendency to perpetuate established views long after evidence leading to contrary conclusions has been obtained. Likewise we have other examples of certain opinions being abandoned too quickly because of some supposedly good evidence that would seem to demand other explanations. Our textbooks, which in every case must be mainly compilations, are largely responsible for this situation. The ordinary investigator finds it easy to consult such sources and a task, frequently beyond his available time, to read and digest the mass of other literature bearing on his problem. It is, therefore, well from time to time to have general reviews of accumulated literature, with attempts to properly evaluate conflicting data. Such a review of the evidence in support of the belief in the Taconic Revolution was undertaken a few . . .