Glacial deposits 53 Beaver Brook Swamp 53 Deposits northeast of Danbury 54 Deposits between Beaver Brook Mountain and mouth of Still River 54 Lakes 55 History of the glacial deposits 56 ILLUSTRATIONS. ----------- To Face Page PLATE I View south on the Highland northeast of Neversink Pond 14 II A. View up the valley of Umpog Creek 40 B. View down the valley of Umpog Creek 40 III Limestone plain southwest of Danbury, in which are situated Lake Kanosha and the Danbury Fair Grounds 44 IV A. View down the Housatonic Valley from a point one-half mile below Stillriver Station 52 B. Part of the morainal ridge north of Danbury 52 V A. Kames in Still River valley west of Brookfield Junction 54 B. Till ridges on the western border of Still River valley, south of Brookfield 56 Page FIGURE 1. Present drainage of the Danbury region 13 2. Geological map of Still River valley 17 3. Profiles of present and preglacial Rocky River 19 4. Preglacial course of Rocky-Still River 21 5. Diagram showing lowest rock levels in Rocky River valley 24 6. Course of Still River 29 7. Map of Umpog Swamp and vicinity 39 8. Profiles of rivers 41 9. Early Stage of Rocky-Still River 49 10. Five suggested outlets of Housatonic River 51 INTRODUCTION The Danbury region of Connecticut presents many features of geographic and geologic interest. It may be regarded as a type area, for the history of its streams and the effects of glaciation are representative of those of the entire State. With this idea in mind, the field work on which this study is based included a traverse of each stream valley and an examination of minor features, as well as a consideration of the broader regional problems. Much detailed and local description, therefore, is included in the text.