CiRC. 162. 



cross the Don by the ferry to Cadeby, where they may join the Mycologists, and 

 work the left bank to Sprotborough and Cusworth. The distance by either route 

 will be about six miles. 



2. — Geologists, led by Messrs. Culpin and Corbett, will go to Conisboro' 

 Common, thence to Ashfield Brickworks, Warmsworth Quarries, and if time permits, 

 to the Boulder Clay at Balby. 



GEOLOGY.— Mr. H. H. Corbett writes :— The district to be investigated in- 

 cludes. Coal Measures, Lower Marls, Lower Jimestone, Middle Marls, and Upper 

 Limestone of the Permian series, the Bunter Sands of the Trias, Boulder Clay, and 

 Post Glacial Gravels. From the top of Conisborough Common the escarpment of 

 the lower Magnesian Limestone is seen very well. It faces nearly due west overlooking 

 the South Yorkshire Coalfield. The upper part is very steep, and is composed of hard 

 stone. Below is a more gradual slope composed of soft clayey and sandy lime- 

 stone, with fossils, Axinus, Turbo, etc. The beds have an eastward dip of 

 about io°. A gentle slope of the land towards Conisboro' corresponds to the dip. 

 On reaching the village a small tributary of the Don is seen to have cut a deep 

 gorge along the line of a fault which throws up the Coal Measures (Upper?) 

 on its easterly side. A splendid section of these rocks is seen at the Ashfield 

 Brickworks. At the top are numerous large boulders, some of which are 

 striated. Most of tliem are from the lower beds of the Lower Magnesian Lime- 

 stone ; there are however a few Grits and Mountain Limestones among them. 

 Below this, and reaching the surface on the western side of the section, are the 

 lowest beds of the Magnesian Limestone crowded with fossils. Next are a series of 

 varied clays, marls, and sandy limestones with a few fossils, these representing the 

 Lower Permian Marls. On the eastern side of the quarry they are much contorted 

 and faulted. Below these, and unconformable to them, are a long series of shales, 

 sandstones, thin seams of coal, etc. Some of these beds contain fragmentary 

 vegetable fossils. On leaving the Ashfield Brickworks and proceeding towards 

 Warmsworth the Lower Limestone is again met with forming the steep sides of the 

 Don valley ; the beds are here very irregular in their dip, having probably been 

 disturbed by the same forces that uplifted the coal measures at the Brickworks. 

 About a mile from Conisbro' on the left bank of the Don is a ridge of rock running 

 up the side of the valley. It contains numerous fossils of Axinus, Mya, Turbo, 

 Terebratula, Retepora, etc. At Warmsworth are to be seen fine sections of the 

 Small-grained Dolomite. The curious lenticular bedding is a marked feature of 

 these rocks. From Warmsworth towards Doncaster a gradual easterly dip brings 

 the Middle Marls and the Upper Limestone to the surface. On reaching Balby the 

 Bunter Sands are seen, nearly horizontally bedded and showing beautiful examples 

 of ripple -marking. Above them are Post Glacial Gravels, strongly current-bedded. 

 Near at hand is the Boulder Clay, which has been described in a previous circular. 



BOTANY.— 



Flowering Plants. — Mr. Corbett writes : — The season is too far advanced for 

 much work to be done in this section. The district is rich in plants characteristic 

 of the Permian rocks, but probably the only species worthy of note to be found in 

 flower now will be Clematis vitalba at Levitt Hagg, Picris hieracioides on Conis- 

 borough Cliffs, and perhaps a few belated specimens of Hypericttm vtontanum. 

 Rose specialists will find many canina forms in the woods. 



Mosses. — There are no records, but the damp parts of old cpiarries should 

 yield good gatherings. 



Fungi. — No records, but abundant opportunities. 



MICRO-BOTANY & MICRO-ZOOLOGY.— Mr. M. H. Stiles writes 

 ihal the ponds and ditches near Cusworth will afford excellent opportunities for study 

 to those interested in these departments of work. The list of Diatoms found here 

 includes Amphora ovalis, Cynibella Ehrenhergii, C. cuspidata, C. cislttla, C. cynibi- 

 formis, C. delicaiula, C. stihaqnalis, Navicula tnajor, N. gracilis, A\ cuspidata, A''. 

 ampkisbivna, N. laiiceolata, N- pygithva, Pleurosigma atteuuatum, P. Spencerii, 

 Eunoiia arcus, Deniicnla tenuis, Staitroneis pharnicenteroii, Diatoma vulgare, 

 Fragilaria Harrisonii , F. mntabilis. Meridian circiilare, Achnantliiditnn Jlexellum, 

 Campylodiscus hibernicus, Sitrirella biseriata. 



The Micro-fauna includes McUcei'ta, Stcntor, etc., etc. 



