. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 512 REPORT OF NATIONAL MUSEUM, 1891. (Fig-. 38), a navigable canal lor the drainage and reclamation of the Anchohne Level, there are indications that at some early day the river was of mnch greater extent and importance, forming tlie drainage of a broad lagoon or swamp, which upon a drift bottom gradually accumu- lated alluvial deposit, interspersed Avith remains of fresh-water vegeta- tion, the age of which may be roughly estimated from th
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 512 REPORT OF NATIONAL MUSEUM, 1891. (Fig-. 38), a navigable canal lor the drainage and reclamation of the Anchohne Level, there are indications that at some early day the river was of mnch greater extent and importance, forming tlie drainage of a broad lagoon or swamp, which upon a drift bottom gradually accumu- lated alluvial deposit, interspersed Avith remains of fresh-water vegeta- tion, the age of which may be roughly estimated from the existence of two well defined forest beds in the Ancholme Level, one just below the surface, and the other formed in the alluvial clay that collected upon and between the bowlders left at the close of the glacial period, both consisting of ])eat with large quantities of well preserved remains of oak, yew, hazel, etc. The ancient lagoon was bordered on the east and Avcst by two well- defined ranges of hills, which contracted in the vicinity of the present Brigg, and there atibrded the i^eople of remote anti(j[uity the only. Fig. 38. ].,OCATin,\ OF AND PLANK WAY. means of crossing this otherwise impenetrable morass. The first record of any attempt to drain this marsh dates back to the reign of Edward L It was reported to Edward 11 that "Man and Cattel ])ass- ing over Glauuford Bridge in the time of fiouds were seldom out of danger," and until the middle of the present century when the drainage of the district was improved, the level was under water for several months each year. It was at this place then, that, in 18S4, a most interesting discovery was made, consisting of a I'Uoilc Hoad situated 0 feet below the i)resent level, and consisting of oaken planks riven from the tree, about lo ftH't in length, and varying in width from 9 to 1(5 inches, fastened side by side and placed with the straight side up, upon small trees and l)ranches laid at right angles to the
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