824 Instruction in Geological Investigation, — 
there one finds cliffs and benches, bars, marshes, and deltas 
The first notable characteristic of these varied forms is that they 
stand almost at a single level, the bars being higher than th 
benches; the second is that they are arranged in close accor 
ance with the general form of the, surrounding country: as 
cliff appears on an exposed headland, not at the end ofi 
crooked, narrow inlet; a bar is strung along from a clift-bena 
and adjacent bars are sympathetic in their attitude; deltasat 
found only opposite valleys, and of a size proportionate to tt 
stream that made them and to its supply with detritus. The d+ 
_ tinctness of these forms is proportionate to the time during 
which the sea abided at their level; and from this we pae 
at once that there has been no other post-glacial shore-line t 
anything like as long a life as the present one, along which ci 
and bars are so well made. Moreover, all these forms p 
assigned to him, but searches intelligently for significant 
water action. On finding a flat, sandy field extending S% 
factory” ; that is, continuous and consistent shore-marks 
not surely found up to a hundred feet elevation, 4 
strongly suspected at sixty feet in some places; 
means that the question is of a larger instead of a pre 
not that it is unprofitable to the student. If the gen% 
cepted post-glacial depression and higher stand 
Boston is thus discredited by local observation, it must 
accepted on the ground of reported depression at has | 
localities, for they may be similarly discredited, 35. 
happened on Long Island. The occurrence of high- matt! 
at Winthrop does not alone suffice to prove 50 large ne 
