Matchedash Bay - Cowan Trail Transition
In Ontario, Canada
Size:  (not chosen)
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The Cowan Trail
This Earthcache quest will take you a short distance along the Cowan Trail, within Matchedash Bay.
This is an Earthcache that the whole family can experience.
Matchedash has very unique geology.
The extensive bedrock outcrop belongs to the Ontario garnetiferous segment of the central garnetiferous belt.
The rock types found in the park reserve consist of garnetiferous biotite gneiss, biotite gneiss, migmatic biotite gneiss, tonalite, and quartz monzonite.
Pegmatite dykes crosscut the bedrock of this region.
This is an area of silt and clay soils that were deposited in the glacial lake.
These materials are well drained and form the western boundary of Matchedash Bay.
The complex structural pattern and the direction of glacier movement have combined to produce a roughly north-south lineation of the bedrock.
It should be noted that the surface water patterns of numerous lakes, floating bogs and marshes indicate the topographical expression of the property.
Features of glacial abrasion, formed as a result of the last glaciation are common on the bare rock outcrops.
Also noted on the bedrock surface was some small disintegration features, the product of freeze-thaw weathering of exposed bedrock.
Bare and thinly soil covered surfaces combined with open water to occupy approximately 50% of the surface area of this area
The surface material on the rest of the property is predominantly water worked ground moraine with sands and silts.
This area is characterized by very shallow soil and bare rock knobs and ridges, which give a very rugged appearance to the landscape.
As you follow the trail and arrive at the posted co-ordinates, you will be standing at the transition point between the two "rock types" common to this area.
Although this transition can be seen in a few places in the region, the immediate change of surroundings is particularly dramatic at the given co-ordinates.
Questions To Be Answered
Please send the correct answers to the following questions to the cache owner in order to log this Earthcache:
Q1: What weathering forces do you think have worked (over time!) to expose the hard rocks you see?
Q2: Where they are not already exposed, there is a thin layer of soil covering the hard rock to your left - what kind of rock is this?
Q3: Which proglacial lake was responsible for the terrain you see today in this area?
Q4: The poorly drained flat floodplain has accumulated far more soil - what kind of rock forms the bed of this area?
Q5: What humourous "proofreading" error made its way onto Post #4 at the Interpretive Centre?
This cache has been placed by a Central Ontario Geocacher!
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Jryy... ivfvg gur Vagrecergvir Prager sbe nafjref!
Last Updated: on 10/4/2013 2:13:51 PM Pacific Daylight Time (9:13 PM GMT)
Coordinates are in the WGS84 datum