Table of Contents.
Letter of Transmittal, by J. P. Lesley.
Letter of Transmittal, by E. V. d’Invilliers.
Letter of W. John Swartzell, about the bounding lines of Mifflin county.
Description of courses and distances of the Union county lines, by R. F. Brown.
| Chapter I. | |
| Page. | |
| Physical geography, area, topography, mountains, rivers, etc. | 1 |
| Chapter II. | |
| Geological structure, | 19 |
| Chapter III. | |
| Stratigraphical geology, | 41 |
| Catskill formation No. IX, | 44 |
| Chemung, Hamilton, Marcellus, No. VIII, | 45 |
| Oriskany, No. VII, | 51 |
| Lower Helderberg, No. VI, | 55 |
| Salina and Clinton, No. V, | 62 |
| Medina and Oneida, No. IV, | 78 |
| Hudson River and Utica, No. III, | 80 |
| Trenton limestone. No. II, | 80 |
| Chapter IV. | |
| Detailed geology of Union county, | 83 |
| 1. Gregg township | 83 |
| 2. White Deer, | 88 |
| 3. Kelley, | 93 |
