Geological variations in this area allowed many seams to develop, some two feet thick, and were among the earliest coal formations in Britain.
12.
They suggest that fungi that could break those substances down effectively only became dominant towards the end of the period, making subsequent coal formation much rarer.
13.
Pocono sandstone can also be found in the watershed, and bituminous coal formations known as the Clarion Formation, the Lower Kittanning Formation and the Eagleton Coal field also exist in the creek's watershed.
14.
However the net result is that, as already stated, almost the base of the Carboniferous series is seen near Craigend, while the Upper Limestone Formation is encountered towards the Forth, having traversed the Limestone Coal Formation between approximately the line of the M9 motorway and Millhall.
15.
From that time until his death, nearly forty years, he was a contributor to the Journal such articles as descriptions and drawings of fresh-water shells found in the Muskingum and other streams, several upon geological subjects, touching upon the geology of Southeastern Ohio, the salt-bearing rock, the history of salt manufacture from the first settlement of Ohio, the coal formation, & c ."
