GEOT.OGIC.^L AND NATURAL HISTOKY SURVEYS. 141 



Caroline, and Queen Anne's counties and later in the season crossed 

 to southern Maryland, where he surveyed the shore of the Potomac in 

 Prince George and Charles counties. Much attention was devoted 

 to the marl deposits of the area visited. 



In 1835 he revisited the Eastern Shore and made geological ex- 

 aminations of Dorchester, Somerset, and Worcester counties, and 

 later of St. Marys County, a full account of which he gave in the 

 report for that year. This report also contained the first announce- 

 ment of the existence of green-sand marl in Kent and Cecil counties. 



In 183G the geologist completed the survey of Calvert County and 

 extended his observations into Anne Arundel, Prince George, and 

 St. Mary's counties, where he likewise announced the discovery of 

 extensive marl deposits. 



A special visit was made to Allegany County, and in his report 

 for the year an account is given of the Frostburg Basin, with its 

 coal and iron deposits. 



In 1837 the survey of Kent, Cecil, and Montgomery counties was 

 completed. The results of the investigations were published in the 

 report of that year, accompanied by topographic maps prepared by 

 Mr. Alexander, and upon which the leading matters of geological 

 interest were noted. 



In 1838 he made a survey of Harford County, and in his report 

 gave a statement regarding its mineral resources, together with a 

 general outline of the geology of both Harford and Baltimore 

 counties, with some remarks on their agricultural condition. To 

 this report he also appended a treatise on lime burning. 



In 1839 he completed investigations in Frederick and Carroll 

 counties and prepared an account of their resources and agricul- 

 tural conditions for his report of the operations of that year. 



In 1840 his operations were confined largely to Washington and 

 Allegany (including Garrett) counties, his report for that year in- 

 cluding chapters on the physical geography, geology, and mineral 

 resources of the State. This report was accompanied by a topo- 

 graphic map on the scale of 1 : 400,000, with a geological profile of 

 the Cumberland and National roads. Additional plates gave a 

 sectional profile of the ore beds worked at Lonaconing, and also a 

 section near the center of the Georges Creek basin. This pampldet 

 constituted the last report of the State geologist, although the office 

 was not abolished until February, 1842. 



During the first year of the survey the topographical engineer, 

 according to tlie wording of the law, was to make a survey for 

 canals, railroads, or other works of internal improvement which 

 the legislature might at any time direct. Under this ruling he 

 was compelled to cooperate, immediatelj^ after his appointment, 



