A Field Day at Aldborough and Bohoughbridge. 



55 



Plants were Gollected by Mr. James Abbott of Leeds, Mr. Webster 

 of York, and others. Their lists included Rammculm Jiederaceus^ 

 Nympkcea alba, and NupJiar lutea in pond at Staveley ; Stellaria 

 nemorum, Cerastium aquaticum, Hypericum perfoUatum, £1. ynoniaiium, 

 Hippiiris vulgaris, MyriopJiyllum spicaium, Ly thrum Salicaria, Bryonia 

 dioica, Pimpinella Saxifraya, Sium angustifolium, Silauspratensis, Myrr/iiff 

 odorata, Lonicera Xylosteum, Valeriana dioica, Hieracivm milgatum, 

 Eupalorium Cannahinum, SoUdago Virgaurea, Seneao Eruc 'ifolius, AntJiemis 

 arvensis, A. cotula, Oampamda latifolia, Veronica Anagallis, ScropJiularia 

 nodosa, Verbena qfficimlis {ScYiveu), EcMmii vulgare, Hoi Ionia pains fr is, 

 LysimacJiia vulgaris, Samolus Valerandi, Chenopodium Bonus-Henricus, 

 Rumex Hydrolapatlmm, Salix SrnitJiiana ? Lemna minor, Sciipus 

 lacustris, Oarex pendula, Glyceria aqiiatica, varieties of Lastrcea filix-mas 

 and Equisetum maximum. The Leeds Society was also much indebted 

 to Mr. J. W. W= Brook, secretary of the Bradford Naturalists' 

 Society, for information on the flora of the district at another season 

 of the year. 



With regard to the geology of the district, Mr. Thomas Tate, of 

 Bradford, states that the district explored is bounded on the west by 

 a well-marked ridge of magnesian limestone, ranging from Knottingley, 

 through Knaresbro', to Ripon, rising to an average height of between 

 200 to 300 feet above the sea. Passing through Knaresbro' station, 

 the party obtained a lovely peep along the banks of the Nidd below 

 the castle ruins ; the junction of the carboniferous grit with the over- 

 lying magnesian limestone being well in view. 



Copgrove and Staveley are built upon the magnesian beds, but the 

 latter are completely hidden by the boulder clay save in two sections 

 exposed in the railway cutting. 



Eastward of Staveley the limestone dips under, and is succeeded 

 by the lowermost member of the triassic series — the Bunter sand- 

 stone. Sections of this were seen in two quarries within the grounds 

 of Aldborough Manor, near the museum ; one of which had supplied 

 the Romans with the building materials for Isurium. Another 

 section has been exposed in lowering the road near the junction of 

 the York and Tadcaster turnpikes, but here, as elsewhere, it is non- 

 fossiliferous. With these exceptions, the entire area is covered by a 

 thick deposit of boulder clay crowded with faintly ice-scratched 

 pebbles from a distance ; the granites and syenites of the lake district, 

 and the carboniferous limestone of the Pennine ransre beino^ the most 

 abundant. 



