Skip to content

Cobequid-Chedabucto Fault Zone EarthCache

Hidden : 6/30/2019
Difficulty:
2.5 out of 5
Terrain:
1.5 out of 5

Size: Size:   other (other)

Join now to view geocache location details. It's free!

Watch

How Geocaching Works

Please note Use of geocaching.com services is subject to the terms and conditions in our disclaimer.

Geocache Description:


To log this earthcache, please don’t stress about answering the questions. Simply send your best attempts in a private message to me, (the cache owner), and then go ahead and log it as found. 

You don’t need to wait for my approval. All attempts will be accepted.

Go ahead and have fun learning! smiley

  1. [REQUIRED] Please post a photo in your log of yourself or a personal item at the outcrop to prove you visited the site.
  2. Describe the colour and texture of the rock face.
  3. What is the most obvious feature of the rock that shows it is part of the fault line? (Hint: do you see any signs of tectonic collision?)

Cobequid-Chedabucto Fault Zone

Cobequid-Cedabucto Fault System

What looks to most drivers as a fairly ugly rock outcrop along the Parrsboro Shore Road is actually a view of one of the most interesting geological features in Nova Scotia.

The Chedabucto Fault is a fault that divides Mainland Nova Scotia from the Minas Basin in the west to Chedabucto Bay in the east into the Avalon zone in the north and the Meguma Zone in the south .The Avalon and Meguma Zones are different because they belonged to different land masses that were widely separated from one another. The Avalon Zone was a part of Laurasia, while the Meguma Zone was a part of Gondwana. It marks the southern margin of the Cobequid Mountains. The Cobequid-Chedabucto Fault Zone is the most prominent geological feature of Nova Scotia.

The Meguma terrane is unique to Nova Scotia. Nowhere else can it be seen on land. Meguma was a lone microcontinent that ended as it moved beside Avalonia along a transcurrent fault, between 360 and 340 million years ago. A complicated fault zone remains to make the boundary between them and can be seen here at Wharton.

The Cobequid Fault is a fault that is the extension of the Chedabucto Fault. This fault runs from Truro to Cape Chignecto south of the Cobequid Hills. Both the Cobequid fault and the Chedabucto Fault form the Minas Fault zone splitting Nova Scotia into the Avalon Zone and the Meguma Zone. Movement on the Cobequid Fault started before 400 million years ago and end around 40 million years ago. Between that time around 350 million years violent volcanic eruptions at Spicers Cove north Cape Chignecto Provincial Park and 50 million years after grey sandstone rich in fossil plants were deposited. At Five Islands Provincial Park there are red rocks formed by the large accumulation of mud, sand and gravel around 210 million years ago.

The Cobequid-Chedabucto Fault System is a major break in the earth’s crust separating the Meguma terrane from Avalonia. Meguma sideswiped its neighbour, sliding from the east, dragging and scrping against Avalonia for several million years. The force made the plates crumble, leaving unstable, easily eroded rock. This type of interaction is known as strike-slip, or transcurrent, motion.

The plate collision created a zone of weakness in the crust, and later stresses caused new displacements. The strong cleavage at this site is unstable and not suitable for climbing. The rock has a silky lustre due to the content of the rock.

Additional Hints (No hints available.)