The older half of this Laurentian series is unconformable to the newer portion of the same.
"The Student's Elements of Geology"
Sir Charles Lyell
Mons, unconformable strata near.
"The Student's Elements of Geology"
Sir Charles Lyell
Queenaig, unconformable Palaeozoic strata at.
"The Student's Elements of Geology"
Sir Charles Lyell