[182] (5

Maculloch Notes made for Glen Roy

[diagram]

in removal by sea - on theory of periods on average being equal 1, 2, 3 ought to have equal masses – ∴ terraces narrower & narrower - that is, as I suppose degrading power being equal - but they will be less in narrow valley than in wide Bay

NB when rivers first occupy old straits of the sea they will tend to wander more horizontally, because they will meet with less obstacle to turn them & streams rather more powerful from slope becoming greater.

p 370. in describing beaches of present lake, makes this structure (which must give inferior lakes [sketch]

6)

p 370. thinks preservation of line owing to thickness & lubricity of the alluvium.

p 371. beaches formed on lakes by check given to descent of alluvium - add lateral movement from swell as on beach: tides if in sea-arm:

NB Macculloch theory leaves quite unaccounted general covering of alluvium, if not detritus as I suppose it is not.

p. 372. (see pencil notes) about terraces of if formed above water fan-shaped - if beneath or in a lake, will not correspond with line, if in a lake then really flat delta:

[insertion:] ie. if lake does not sink

if by sea, during elevation then slope is allowable - indeed probable both above & below line from greater quantity of matter.