MARYLAND GEOLOGICAL SURVEY 35 



Another chart was published by Hauducoeur in 1799, which em- 

 braced the region about Havre de Grace and the head of the Bay. 

 The chart is beautifully executed and the topography of each side 

 of the Susquehanna river is expressed in hachure. The map extends 

 from Spesutia Narrows to a point about five miles beyond the Mason 

 and Dixon Line. On each side of the river throughout this district, 

 the position of roads, streams, houses, property boundaries and the 

 condition of cultivation, is indicated; even names are attached to cer- 

 tain of the roads and farms. An attempt is also made to depict the 

 character of the bottom which underlies the mouth of the Susque- 

 hanna and the region about the head of the Bay. 



In 1794, Dennis Griffith assembled all available information and 

 published a map of the entire State which was not excelled until 

 Alexander began the publication of his maps in the fourth decade 

 of the last century. In Griffith's map the outline of the coast around 

 the head of Chesapeake Bay is platted in about the form which we 

 know it today. The principal streams of Cecil county and a large 

 number of towns are also represented. 



A marked advance in the cartography of this region occurred in 

 1839, when Prof. J. T. Ducatel, then State Geologist of Maryland, 

 published his geological report of Cecil county. This report was 

 accompanied by a map of the region prepared by John H. Alexander. 

 This map of Cecil county was the best that had been produced and 

 was not excelled until the map which is published by the present 

 State Geological Survey. In the Alexander map, the topography 

 was expressed by hachure and the map executed on the scale of 

 1:150,000. The coast-line was laid down with greater accuracy than 

 in any map published up to that time, and an attempt was made to 

 distinguish between the topographic features of the Coastal Plain and 

 those of the Piedmont Plateau to the north of it. The elevations, 

 however, are represented by sketches of conical hills which give the 

 impression of volcanic cones rather than of a generally rolling 

 country. 



During the summer of 1845, the U. S. Coast and Geodetic Survey 

 began the survey of the shore-line about the head of Chesapeake 

 Bay. The maps, which were subsequently published, attained a 



