Page:Report on the geology of the four counties, Union, Snyder, Mifflin and Juniata (IA reportongeologyo00dinv).pdf/146

118 F³. Union, Centre and Mifflin counties on the Lewisburg and Tyrone railroad in the valley of Penns creek; thence along the Mifflin county line 8. 53½° E. 119 poles toa stone on the north side of Penns creek, and with that county S. 2½° W. a little over 2 miles to the summit of Jack’s mountain and a corner of Snyder county. This this north and west line has a total length approximating 20 miles, and the total area of the township is from 60-70 square miles.

Nearly all the various water courses already mentioned rise in this portion of the county, and eventually find their way eastward into the Susquehanna river; but of these Penns creek, the most southern, is likewise the most important, flowing through the upper Buffalo valley along the north base of Jack’s mountain for something over 12 miles and with its main tributary, Laurel run, in Hartley township, drains nearly one-half of that township. Buffalo creek, through its branches and White Deer creek complete the drainage of the northern portion of both townships.

Lewis township is without any prominent village, although Hartleton and Laurelton, just beyond its western line in Hartley township, are thriving villages within easy access. In addition to these considerable settlements are being made in the vicinity of the several stations along the line of the Lewisburg and Tyrone railroad.

Each one of the six sub-divisions of the Buffalo mountain range lying between the White Deer mountain on the north and Jack’s mountain on the south, is represented en échelon in these two townships, and all of them being anticlinal ridges they show pairs of double hills, five of them eroded along their center lines to expose areas of the Hudson river No. III slates, and each pair separated by valleys of the lower Clinton measures along the principal water courses of the district.

The rock series of these two townships extends from the top of the Hudson river slates upwards to the Lower Helderberg or Lewistown limestone, the latter rocks only existing in a small triangular area at the western end of the Mifflinburg synclinal ridge, in Lewis township south of the railroad.