88 



YORKSHIRE NATURALISTS AT HATFIELD CHACE. 



consisted of moderately fine sand, 77 parts; alumina, 6; carbonate 

 of lime, 6 ; carbonate of magnesia, i ; soluble salts, 2 ; oxide of iron, 

 2 ; and organic matter, 6. A local geologist (Dr. Arbuckle) stated 

 that the usual sequence of the beds in the district of Hatfield Chace 

 were — (i) the warp already alluded to; (2) peat, with the remains of 

 an ancient forest at the base ; (3) sand ; (4) shiny laminated clay l 

 and (5) gravel and sand. The Triassic Sandstones, capped with recent 

 gravel, rise here and there as bosses. Near Lindholme the only 

 section seen during the day was examined ; this was a gravel-pit, the 

 gravel resting upon a bed of sand, almost consolidated into stone, 

 and having the name of ' pan sand.' The boulders and pebbles 

 extracted from the gravel were of great variety, and very interesting 

 from this reason. Specimens of sedimentary rocks, as magnesian 

 limestone, carboniferous sandstones of various kinds, gannister and 

 millstone grit ; rocks of volcanic or igneous origin, as porphyry and 

 basalt, and other rocks such as quartzite, vein quartz, black f^mts, 

 and chert were obtained. There is little doubt that these gravels are 

 re-arranged glacial deposits, washed from the waste of the till or 

 boulder clay during some of the post-glacial submergences. It 

 should be stated that two of the pieces of gannister found showed 

 most plainly the well-known markings of stigmaria. A short walk 

 brought the party to the perfectly solitary mansion of Lindholme 

 Hall; a visit to which was, perhaps, the chief object of the geological 

 section. There are two celebrated boulders on the west front of the 

 hall, and it was for their examination that the visit was made. By 

 the courtesy of Mr. Wright, they were accurately measured by Mr. 

 Brownridge, F.G.S., and other particulars obtained, in accordance 

 with the schedule issued by the Yorkshire Boulder Committee. One 

 boulder was undoubtedly of millstone grit, the other was more 

 dubious, and a small chipping was kindly permitted from it for future 

 determination and report. The name of the traditional William of 

 Lindholme (about whom so many legends were related) is connected 

 with these boulders, but, as usual, in a mythical manner. A long 

 walk along dike-banks and grass-grown lanes had to be made before 

 arrival at Hatfield. 



For the Section of Micro-Zoology and Micro-Botany, the secretary, 

 Mr. J. M. Kirk, of Doncaster, reported that the following forms had 

 been met vvitli : — Entomostraca : Daplinia pulex^ Cyclops qiiadri- 

 £or?its, Diaptomus castor^ Eurycercus laniellattis^ Canthocamptus 

 }ui?mt7is. Infusoria : Loxodes bursar ia^ Lindia torulosa, Chcetonarus 

 lariis^ Pitrodiiia patino^ Steiitor inuHeri, Paraineciiun aurelia, Actmo- 

 p/irys sol, Traclielocera viridis, Amphileptus fasciola, Coleps hir/us, 

 Dileptus foliu?Ji, Aco77iia vitrea, Urostyla grandis, Vorticella nebulifei-a^ 



Naturalist, 



