Cascadia was originally defined as a hypothetical landmass that once lay
to the west of the present Cascade Range (see King, P.B.,1959,The evolution
of North America: Princeton Univ.Press, p.161). In 1972, Bates McKee redefined
it to include a much larger area of southern B.C., Washington, Oregon, Idaho,
and northern California (McKee,Bates, 1972, Cascadia-The geologic evolution of
the Pacific Northwest, McGraw-Hill, 394 p.).More recently, a number of other
geologists have used the term "Cascadian subduction zone" to describe an east-
dipping slab of oceanic crust that is currently being carried down beneath the
Cascade Range from Mt. Lassen in northern California to near the north end of
Vancouver Island on the north.It seems to me that Cascadia is thus a geological
rather than a geographical term and to name a book "Shorebirds of Cascadia"
would not be a good idea even if the area in question coincided with that of
the subducting Juan de Fuca plate.