SUPERINTENDENT ~Herbert E. Gregory~ _Publication Approved by the Board of Control_ Drainage Modifications and Glaciation in the Danbury Region Connecticut By RUTH SAWYER HARVEY, Ph. D. HARTFORD Printed by the State Geological and Natural History Survey 1920 CONTENTS. ------ Page Introduction 9 Regional relations 11 Rocky River 15 Description of the river and its valley 15 Relation of the valley to geologic structure 16 Junction of Rocky and Housatonic Rivers 18 Abnormal profile 18 Preglacial course 20 The buried channel 23 Effect of glaciation 25 The Neversink-Danbury valley 27 Still River 30 Statement of the problem 30 Evidence to be expected if Still River has been reversed 31 A valley wide throughout or broadening toward the south 32 Tributary valleys pointing upstream 34 The regional slope not in accord with the course of the Still 35 Evidence of glacial filling and degrading of the river bed 36 Glacial scouring 36 The Still-Saugatuck divide 38 Features of the Umpog valley 38 The preglacial divide 42 The Still-Croton divide 43 Introduction 43 Features of Still River valley west of Danbury 43 The Still-Croton valley 44 Glacial Lake Kanosha 45 Divides in the highlands south of Danbury 46 The ancient Still River 47 Departures of Still River from its preglacial channel 48 Suggested courses of Housatonic River 50