. Maryland geological survey. for many other courtesies. TheBritish Museum through Dr. A. Smith Woodward rendered invaluable PREFACE 19 assistance in contributing a large number of English Wealden plantsfor comparison, and Professor Yokoyama of Tokio kindly forwardedJapanese material of Onychiopsis. Dr. Albert Mann of the Departmentof Agriculture and Doctors F. H. Blodgett and W. Ralph Jones have con-tributed photo-micrographs or camera lucida drawings. The U. S. Geological Survey has cooperated in furnishing a largenumber of the illustrations and in various other ways. Finally any student of
. Maryland geological survey. for many other courtesies. TheBritish Museum through Dr. A. Smith Woodward rendered invaluable PREFACE 19 assistance in contributing a large number of English Wealden plantsfor comparison, and Professor Yokoyama of Tokio kindly forwardedJapanese material of Onychiopsis. Dr. Albert Mann of the Departmentof Agriculture and Doctors F. H. Blodgett and W. Ralph Jones have con-tributed photo-micrographs or camera lucida drawings. The U. S. Geological Survey has cooperated in furnishing a largenumber of the illustrations and in various other ways. Finally any student of Lower Cretaceous floras must acknowledge hisgreat indebtedness to previous workers who have contributed to ourknowledge of these floras, more especially to Professor Seward inEngland, the late Marquis Saporta in Portugal, the late Professor Os-wald Heer in the Arctic regions, and Professors Ward and Fontaine inthis country. THE LOWER CRETACEOUS DEPOSITSOF MARYLAND BY WILLIAM BULLOCK CLARKARTHUR B. BIBBINS AND EDWARD W. BERRY. THE LOWER CRETACEOUS DEPOSITS OF MARYLAND BY WM. BULLOCK CLARK, ARTHUR B. BIBBINS, AND EDWARD W. BERRY INTEODUCTION A knowledge of the Lower Cretaceous deposits of Maryland can onlybe secured througli an understanding of the physiography and geologyof the broad province of which the State of Maryland forms a part. Thephysical features which characterize this area may be traced for varyingdistances into adjoining regions^, some being recognized as far as theISTew England coast on the north, and others as far as the Gulf Eegionon the south. The Physiography The region here considered forms a portion of the Atlantic slope,which stretches from the crest of the Alleghanies to the sea, and whichis divided into three more or less sharply defined regions known as theCoastal Plain, the Piedmont Plateau, and the Appalachian three districts follow the Atlantic border of the United Statesin three belts of varying width from New England southward to theGru
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectpaleont, bookyear1901
