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.

The matter in the present bulletin formed the main theme of a thesis
on "Drainage and Glaciation in the Central Housatonic Basin" which was
submitted in partial fulfillment of the requirements for the degree of
doctor of philosophy at Yale University.

The field work was done in 1907 and 1908 under the direction of
Professor Herbert E. Gregory. I am also indebted to the late Professor
Joseph Barrell and to Dr. Isaiah Bowman for helpful cooperation in the
preparation of the original thesis, and to Dr. H. H. Robinson for
assistance in preparing this paper for publication.

DRAINAGE MODIFICATIONS AND GLACIATION IN
THE DANBURY REGION, CONNECTICUT
--------
By Ruth S. Harvey

REGIONAL RELATIONS

The region discussed in this bulletin is situated in western
Connecticut and is approximately 8 miles wide and 18 miles long in a
north-south direction, as shown on fig. 1.[1] Throughout, the rocks
are crystalline and include gneiss, schist, and marble--the
metamorphosed equivalents of a large variety of ancient sedimentary
and igneous rocks.

For the purposes of this report, the geologic history may be said to
begin with the regional uplift which marked the close of the Mesozoic.
By that time the mountains formed by Triassic and Jurassic folding and
faulting had been worn down to a peneplain, now much dissected but
still recognizable in the accordant level of the mountain tops.

Erosion during Cretaceous time resulted in the construction of a
piedmont plain extending from an undetermined line 30 to 55 miles
north of the present Connecticut shore to a point south of Long
Island.[2] This pla