i 
Tertiary Gravels in Aberdeenshire. PAT 
and of Windyhills.t The quartzite material at Windyhills, he held, was 
derived from the underlying Highland Schists, and thus the gravels 
were local. He gave an outline of the Buchan Ridge along its length. 
Two years later he gave a sketch-map showing the distribution of 
the gravels in Buchan.” In 1865 he described the Delgaty deposits 
in some detail; he showed that the gravels were there covered by 
boulder-clay, and he grouped these gravels with those of Windy- 
hills and the Buchan Ridge as Preglacial Traces.? In his last paper, 
which may be considered to express his final conclusions, Jamieson 
Says :— 
-No remnant of pre-Glacial Tertiary deposits has hitherto been found in 
any part of the area (loc. cit., p. 13). 
He now admitted that the material of the gravels is not of local 
origin, but rolled and long travelled. Most important is, however, 
his withdrawal from his position that these gravels were pre-glacial. 
He says :— 
The Chalk flints... have... I suspect, been brought from the 
Moray Firth by .. . glacial agency. These Flints . .. may have been 
shed off along the southern border of one of the streams of ice which 
brought so great a quantity of other debris from the Moray Basin (loc. 
Cis) 705 ZAY)) 
With regard to the Delgaty section, Jamieson considered the 
boulder-clay which there covers the gravels to be due to “‘ a recurrence 
of glaciation after the flints were laid down”. Dr. Bremner ° has 
assembled the theories on the origin of these deposits, and has 
pointed out that a study of the ae would be most likely to 
lead to some definite result. 
THE Detcaty OUTLIER. 
At Delgaty the quartzite gravel covers a small area, only a quarter 
of a square mile, on the summit of a hill whose highest point is 
399 feet. The base of the deposit may go down to near the 350 feet 
line. This hill is by no means the highest in the district, as there 
are others within a few miles of it rising to five or six hundred feet, 
but these hills have rock at their summits or are covered only by a 
thin skin of boulder-clay. The country rock is Macduff Slate of the 
Highland Schists, and red sandstones of the Middle or Orcadian 
old Red, and. the Delgaty gravel seems to rest on both of them in 
different parts ‘of its area. Most of the outlier is covered by heath 
and wood, and there is no cultivation ; the exposures in ditches and 
small overgrown pits are few and unsatisfactory. Fortunately, 
however, there is a gravel-pit which is being actively worked for 
+“ On the Pleistocene Deposits of Aberdeenshire”’: Quart. Journ. Geol. 
Soc., vol. xiv, 1858, p. 528. 4 
2 Quart. Viswnrie Geol. Soc., vol. xvi, 1860, p. 348. 
3“ On the History of the Last Geological Changes in Scotland”’: Quari. 
Journ. Geol. Soc., vol. xxi, 1865, p. 164. 
4“°The Glacial Period in Aberdeenshire and the Southern Border of the 
Moray Firth’’: Quart. Journ. Geol. Soc., vol. 1xii, 1906, p. 13. 
° “Problems in the Glacial Geology of North-East Scotland”: Trans. 
Edin. Geol. Soc., vol. x, 1916, p. 344. 
