. The geology of New Hampshire : a report comprising the results of explorations ordered by the legislature. Theyare mostly those that have just started on their travels. Between Doverand Exeter the loose fragments of sienite scattered over the area occu-pied by this rock are numberless, and commence abruptly on the north-west side. One knows that he has reached the sienite rock by thenumerous blocks of it seen long before a ledge can be found, it may suppose their abundance is to be explained by their difficult decompo-sition. Large Boulders. Although our state is noted for the great abu
. The geology of New Hampshire : a report comprising the results of explorations ordered by the legislature. Theyare mostly those that have just started on their travels. Between Doverand Exeter the loose fragments of sienite scattered over the area occu-pied by this rock are numberless, and commence abruptly on the north-west side. One knows that he has reached the sienite rock by thenumerous blocks of it seen long before a ledge can be found, it may suppose their abundance is to be explained by their difficult decompo-sition. Large Boulders. Although our state is noted for the great abundance of bouldersstrewn over its surface, it is only quite recently that I have seen boul-ders in our limits larger than any of which mention has been made inthe writings of American geologists. They were brought to our noticeby His Excellency Governor Prescott. Regret had been expressed tohim that no boulder had been found in the state equal in size to thoseknown to exist in the neighboring states. As if he felt the credit of thestate impaired by the imputation, he immediately searched the neighbor-. GLACIAL DRIFT, 265 hood of Pawtuckaway mountain, and found a very formidable array ofgiant fragments superior to anything else described elsewhere. Thecelebrated Picrre-a-bot of the Jura contains about 40,000 cubic feet,weighing 3,000 tons ; the Green Mountain Giant of Whitingham, Ver-mont, has the same cubical contents; the one formerly existing at FallRiver, Mass., now destroyed, is estimated to have weighed 5,400 Churchill rock of Nottingham, shown in a heliotype at the begin-ning of this chapter, measures 62 feet long by 40 wide, and is estimatedat 40 feet high. Making liberal allowances for irregularities in itsdimensions, it contains over 75,000 cubic feet, weighs 6,000 tons, andis therefore nearly double the size of the Jurassic and Vermont exam-ples. Binghams rock at Smugglers notch in Vermont is larger, but isso connected with a ledge as not to be properly estee
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