A. dolomite and sandstone.
"The Student's Elements of Geology"
Sir Charles Lyell
The pebbles and fragments of older rocks which constitute the conglomerate are cemented together by a red or yellow base of dolomite, and in some places the encrinites and other fossils derived from the Mountain Limestone are so detached from the parent rocks that they have the deceptive appearance of belonging to a fauna contemporaneous with the dolomitic beds in which they occur.
"The Student's Elements of Geology"
Sir Charles Lyell
In many cases dolomite is merely a metamorphosed limestone.
"Geology"
James Geikie