Bulletin, geologic series 47

The major geologic facts about this region have been known for many years. For the most part, this knowledge is a result of investigations made under the direction of the New Jersey State Geologist and published in the Bulletins and Annual Reports of the Geological Survey of New Jersey. Publications of the Topographic and Geologic Survey of Pennsylvania and various scientific journals also contain information which relates directly or indirectly to the geology of the region. The emphasis in these publications has been on those geologic formations which are surfieially extensive and of economic importance. The Hardyston formation is limited both in economic importance and surface expression, yet it is of decided value in delineating the geology of the region. A great deal of uncertainty has existed for some time regarding the extent of this formation, the reasons for its lack of surface expression in places, and local variations in its lithology. The purpose of this paper is to further explain and present the solutions to these problems in the region of Phillipsburg, New Jersey. The conclusions reached are the result of six weeks of field study of the region during the summer of 1938 and several later visits