. The geology of New Hampshire : a report comprising the results of explorations ordered by the legislature. ANDOVER AND HAVERHILL SERIES OF KAMES. 169 and descends into river valleys in a certain apparent independence of the natural con-figuration of the country. Tlie laud, however, though undulating and somewhatbroken, nowhere in this part of Massachusetts rises more than 300 or 400 feet abovetide-water; and even these heights are reached only by peculiar accumulations of un-modified drift or till, which here forms massive rounded hills. The gravel ridgesplainly belong to the superficial dep
. The geology of New Hampshire : a report comprising the results of explorations ordered by the legislature. ANDOVER AND HAVERHILL SERIES OF KAMES. 169 and descends into river valleys in a certain apparent independence of the natural con-figuration of the country. Tlie laud, however, though undulating and somewhatbroken, nowhere in this part of Massachusetts rises more than 300 or 400 feet abovetide-water; and even these heights are reached only by peculiar accumulations of un-modified drift or till, which here forms massive rounded hills. The gravel ridgesplainly belong to the superficial deposit, since they everywhere overlie the ground-moraine or till. They rest upon the flanks of these hills at Lawrence near the reser-voir; at Ballard Vale, on Pole hill; at Wakefield, near the rattan works ; in the north-east part of Middleton ; and on the north bank of the Merrimack in Haverhill, oppositeto and a little below Groveland. Sometimes the ridges disappear in a sandy plain, in which case, however, there areusually bowl-shaped depressions in the plain along the line of general direction. Thisi
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