1903-4. | A Forty-MILE SECTION OF PLEISTOCENE DEPOsITs. 13 
and a-half east of Cobourg pier, immediately beneath these sands and 
overlying a deposit of boulder till, are found about eight feet of a dis- 
tinctly stratified clay which presents a peculiar banding. The section is 
about one quarter of a mile in length. The banded appearance of the 
clay is due to the alternate deposition of fine and slightly coarser 
materials in beds varying from one-half to one inch in thickness. In 
this bedded clay are found numerous pebbles and small cobbles, some of 
the latter being distinctly: striated. The most striking feature of the 
banding is that in places it is very much twisted and contorted,so much 
so that the contortions can be best likened to those found in contorted 
eneiss. 
For the next five miles, to’a little beyond the western boundary of the 
town of Cobourg, clay till occurs with bed rock outcropping from beneath 
it at frequent intervals. This till reaches its maximum thickness, about 
forty-five feet, a mile and a-half east of Cobourg pier. In the western 
part of the town the upper surface of the till near the lake is below 
water-level and is overlain by sand deposits. It again appears ina 
dome-shaped hill at Weller’s Point a little further west. For the next 
mile, west from Weller’s Point, the till is again overlaid by sands. The 
upper surface of these sands gradually descends to lake level, and from 
Green Point to within a mile of Port Hope the shore is formed by a 
barrier beach. 
A mile off shore opposite Green Point lies Gull island, the most 
westerly exposure of Trenton limestone found along the shore of Lake 
Ontario.* Under the water there are numerous cobbles and a few 
boulders still lying on the bed rock. It is not improbable that at one 
time the island was formed by a drumlin, now long since removed by 
the waves. 
The till sheet which forms the cliff east of Port Hope harbour extends 
along the shore for about a mile until it is interrupted by Smith’s creek, 
which enters the lake at this place. A third of a mile west of the pier 
the shore section shows that it is overlaid by stratified sands. Half a 
mile further west these sands in turn are found to be capped by a 
second boulder till. A section at this place shows above lake level five 
‘feet of the lower till, ten feet of stratified sand, and six feet of the upper 
till. The thickness of the sands between the till sheets diminishes to- 
wards the west and at a mile and a-half west of the town the upper till 
rests upon the lower. A little over two miles west of Port Hope the 
* Limestone is exposed in the bed of Smith’s creek at Port Hope, a few chains north 
of the harbour. 
