Aulacomnion androgynum 

 Webera critda 

 Bryian alpimwi 

 „ fallescens 

 Zieria j ulacea 

 Meesia tdigitiosa 

 Bartraniia Halleriana 



WEST TEES DISTRICT. 



137 



Fissidetis osmundoides 

 AncRctangium compadum 

 Amblystegiuvi Sprit cei 

 Orthothechim iniricatum 

 Hypnuvi incurvatimi 

 Plagiothechim pidchellum 

 Fontinalis squamosa. 



At the Lune, which at its junction with the Tees is 700 feet 

 above the sea-level, Upper Teesdale may be considered to ter- 

 minate. Respecting the geology of the tract almost all which 

 is necessary to say is contained in the geological chapter. At 

 the bottom of the upper part of the dale, forming the cliffs of 

 Cronkley, and those over which the river falls at the Caldron 

 Snout, is the great basaltic mass, which extends up Maize Beck 

 for a couple of miles and in an eastern direction occupies the 

 bed of the stream as far as the High Force. A little lower 

 down it leaves the bed of the river and ranges along the 

 southern slope of the dale almost as far as the Lune. The 

 stratification of the sedimentary rocks is much disturbed and 

 complicated by the four faults of which we have spoken and 

 others of lesser importance. From a floor of Basalt rises upwards 

 the Mickle Fell ridge, the Lower Mountain Limestone at the 

 bottom, but the greater part of the slope made up of the Upper 

 Mountain Limestone, which has patches of Millstone Grit over 

 it in two places. From this ridge there are down-throws towards 

 Westmorland and towards tlie east and lower down the dale a 

 down-throw or steep dip towards the North, so that first the 

 Lower and afterwards the Upper Limestone occupies the river- 

 bed. And then comes the thousand feet fault which runs along 

 the line of Lunedale, beyond which nothing is seen but Mill- 

 stone Grit till we reach the Greta. 



The most noteworthy characteristic which U])per Teesdale 

 presents from a botanical point of view is, that it furnishes 

 several Montane rarities which are separated more or less con- 

 spicuously from the other localities in which they occur. 

 Restricting ourselves to the flowering plants of the Yorkshire 



August 1888. 



