The Huron Expositor, 1978-07-13, Page 28H N DA
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6 7— SUMMER RECREATION ISSUE, JULY 12', 1918
Ontario's landscape is
like a blackboard
The landscape of Southern
Ontario is a little like a blackboard
that has been written on over and
over again, with each successive
layer of writing imperfectly 'eras-
ed and still partly legible,through
later, layers, says Prof. Ward
Chesworth, Departmentrof Land
Resource.,..Sciedee. UniVersity of
Guelph. Geologists try to
thrOugh these layers, ri
to fhe- earliest o
that the
read
only memorial, points out the
University of Guelph scientist.
Probt;beneath the sedimentary
layers and you reach dry :,and
again in the' shape of gentl
rolling hills and' valleys
bp as much as 8
old. Prof
ght back
ne, in the 'hope
,y can reconstruct a piece
the earth's history.
The latest marks that have
been —Written " on the lanc)S-
cape arc the signs of the white
man's Settlement of this country.
Towns, industries and cultivated
roacis and railroads all give
'Ontario the comfortable "Lived
in" look ‘v,ie take for granted.
. Prof. Chesworth points ouit this
white man's layer is really quite .
alien to the land underneath, a
land first colonized - by.the Indian
sonic 12.000 years agii. EVen to
these first corners that older
landscape intim have ajipeared
alien abet inhospitable, with its
hilly moraines. gravel ridges and -
sheets of sandy outwash by
unpredictable streams. •'.here
were no forests then. to softer, the
harsh features of the land, only a
sparse Arctic type of vegetation
slowly taking over where glaciers,
had been' La short time before.
Take off this glacial layer and
beneath it you lirrd stAimentary
rocks that show that 400 million
years ago-Ult.:x.6 was pi) la ndsca
here. only a -seascape. A shallow
sea L covered all Of Southern .
Ontario and organisms that liyPd
and huild reefs in it have left
behind fossilized forms as their
•
y
that may
00 million years
Chesworth says we
on't know what it looked like
precisely, but to our eyes it would
have appeared very bare and
uninviting. There would have been
•
notrces, no flowers and no grass..
all of which were still hundreds of
millions of_y eats into the future.
If you lurk closely at—the-rocks
that form this ancient landscape
you find- clues to an even qtrher
One in the form of granite, a rock
that originates in the'deep core of
mountain chains, and basalt, the
commonest of all volcanic rocks.
They show that more than a
billion yetirs ago Ontario was a
mountainous land with active
volcanoes throwing out streams-of
molten lava. And structures in the
rocks shoW that these mountains
and volcanoes .were preceded by
earlier ones going back to two and
a half., and perhaps even: three
billion years ago..
At Oils point, says.the Univer-
sity of Guelph scientist, tlie
writ in.g, becomes unreadable and
no record can be found of earlier
Ontario landscapes,: What did it
look like four billion. years ago?
We have tio direct way of
knowing, concludes Prof. (hes-
,wto-th. but some geologists have
slit.tgested that it .probably re-
sembled the surface of the ,moon,
pitekmarked with . craters and
'covered in loose rubble, a far cry
from the countryside we know
bxlay. •
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