It’s now late August, and most students are moving into their dorms on campus but not us. We are in Halifax and have just completed our first mid-term exam with a final exam for ES210 Climate Change and Glacial Geology approaching a mere 10 days away. After the mid-term we were able to get a breath of fresh air and visit the Citadel, a British/Canadian military fort from the 1800’s built on top of a drumlin (a 500 m long oval mound of unconsolidated sediment deposited under the outermost 100 km periphery of a warm-based continental glacier). Soldiers serving here probably never knew they had their elevation advantage due to a glacial deposit.
We started the following day driving 40 minutes east through Dartmouth (home of Netflix’s Trailer Park Boys) to Lawrencetown and its well exposed drumlin. We chose this spot because the ocean has eroded away some of the drumlin’s side, exposing about 25 of unsorted sediment. On this steep slope there were two distinct layers that are thought to be approximately 70,000 and 11,000 years old. There was 6.8 meters of grey, massive sand, silt and cobbles and approximately 20 meters of a similar red sediment. Glacial shear causes the long axis of the rocks to point in the direction of flow. Our objective was to measure the orientation (trend and plunge) of elongated pebble- to cobble-size rocks to see if the direction they pointed was different in the grey and red layers. We braved what felt like Mount Everest (a whole 15 meters) with the open ocean directly behind us in order to find elongated rocks. We hypothesized a second (red) drumlin was deposited on top of an older (grey) one, creating the two separate layers. Some of the cobbles we had to dig out……..with the same shovel we previously lost and then found in Fundy. After we took our data we all fell asleep on the ride home, no one moved for the entire 40 minutes. We were incredibly tired from braving treacherous hills, but we had breakfast for dinner to look forward to! After a long day it was time to wind down and type up our lab reports for the day, as a science course without a lab report would not be a real science course.
Joe O’Reilly ’18 & Tyler Allen ’18