ST. YVON
St. Yvon is along the
southern shores of the St. Lawrence Seaway & along the northern margin of
the Gaspé Peninsula in southeastern Canada. The bedrock here is a
succession of Middle Ordovician turbidites - the Cloridorme Formation.
The rocks are tilted landward (see cliff in the photo below). In the
intertidal zone, the Cloridorme Formation has been planed off into a wave-cut
platform. The tidal pools on this platform are elongated, occurring
between narrow, long, linear ridges of rock. The platform has a
wonderful, easily examined, modern hardground biota consisting of shelly &
fleshy encrusters and vagrants.
Above: The Cloridorme Formation
is a world-class turbidite succession that contains beautifully preserved Bouma
Sequences. Good climbing ripples and flute casts are present, as are flame
structures. The convoluted, dark wispy laminations in the brownish
bed shown above are flame structures, formed by post-depositional, horizontal
shear.