STRATIGRAPHICAL ORDER. 107 
of which is the Lower Sunday Creek field, where the coal is known as 
the Bayley’s Run coal. This becomes the Norris coal at Millertown, 
and the Stallsmith seam of Hemlock and vicinity. It is also the Happy 
Hollow coal of Buchtel and vicinity. 
The relations of these seams can be thus expressed : 
Upper Freeport coal. iti 
Wan Ge rev alia cewesc ay watecsen Geen se cus nece sete te soca ceesives Sedacecube ss cael sWais «deel 5 to 25 
Upper Freeport limestone. 
Bie lini Gersviaal a eeane tesa eI Reta SE Die Le ee ed, datas 20 “ 40 
Lower Freeport coal. 
TIC Tay a] eee toes seek vce se sscles sete nee dusk cassie oes Seve se'leso nes vetse exelesenge ease 5 
(Lower Freeport limestone), not persistent. 
NEC TGVi RR eee teen sees cacucventioscsveis sconisecewscsecetuoes teeesheetbs cee eataseee ses 25 “ 50 
Middle Kittanning coal. 
NnnGe vial treereneccesccericccceee secotarcchiveterrccces csesscacectessessereses svete 20 “ 30 
Lower Kittanning coal. 
IT am now disposed to count the Snow Fork and Norris limestones 
of my report on the Hanging Rock District, vol. III, as one and the 
same, viz., the Lower Freeport limestone. For the duplication of these 
and the associated elements, probably the report above referred to is 
responsible in larger degree than any other publication. 
The subject must not be left without the further acknowledgment 
that there is a complexity of composition in the Upper Freeport hori- 
zon which does not appear in the sections thus far given. There is 
sometimes a real duplication of coals here that will appear in subsequent 
discussions. 
The Cambridge and Ames limestones, and also the Brush Creek 
coal (No. 7a) are all steady elements in this field. The Brush Creek 
limestone has a large development as an impure ore (bastard limestone) 
in the Sunday Creek Valley. It is known as the Dugway ore near 
Ewing site. 
Another fine development of the Upper Freeport coal is found near 
Nelsonville, in what is known as Happy Hollow. The Nelsonville Coal 
and Coke Company have opened large mines in the seam at this point, 
and it has proved to be a basis for successful mining. The section as 
seen in this vicinity is as follows, the leading elements and their inter- 
vals only being noted : 
