Traligill
The
Traligill Burn site is famous for its karst geomorphology whereby the course
of the river runs underground for 400m. The seasonally-dry river bed has excavated
a minor thrust surface. On the northern side of the dry valley is a 20°-25°
dip surface of the Eilean Dubh Formation limestones in the footwall which
are parallel to the thrust surface. In contrast, the hanging-wall is marked
by more gently inclined (10°-15°) strata of the Grudaidh Formation. These
relationships are indicative of a hanging-wall ramp upon footwall flat fault
geometry and the older upon younger stratigraphic separation is diagnostic
of thrusting. The thrust itself is marked by readily-eroded carbonate gouge
and a few cm of breccia.