Vol. 68.] AEBEN SANDSTONE GEOTJP OF WARWICKSHIEE. 255 



not lie on a higher horizon. The position of the Henley-in-Arden 

 sandstones is stated (59, p. 42) to iDe 



' about 250 feet below the lowest bed of the Lias, and they are separated from 

 the Lower Keuper Sandstone by about 350 feet of red marl.' 



Our knowledge of the stratigraphy and geological structure o£ 

 this area has advanced little since Mr. Howell's map and memoir 

 were published, as later workers have turned their attention almost 

 exclusively to the collection and description of the fossil contents 

 of the sandstone zone. ISFumerous papers, extending over a period 

 of forty years, by the Kev. P. B. Brodie gave accounts of the zone, 

 especially as developed at Eowington and Shrewley, and have 

 recorded from time to time additions to its fauna and flora — the 

 most important and interesting discovery being the recognition 

 (93 & 94) of a green gritty band at the base of the sandstone, which 

 contains abundant fish-spines and teeth, as also casts of marine 

 molluscan shells. Mr. E. P. Eichards (94), who was associated 

 with Brodie in this discovery, found that this band could be traced 

 in the sandstone at other localities, as at Knowle and Preston 

 Bagot. The fossils of the zone have been described by Sir Philip 

 Egerton (58), T. Eupert Jones (62), Murchison & Strickland (37), 

 Mr. E. T. Newton (87), Mr. E. B. Newton (94), and Dr. A. Smith 

 Woodward (89^, 89^, & 93) ; and studies of the footprints have more 

 recently been made by Mr. H. C. Beasley, and recorded in the 

 Eeports of the British Association by the Committee appointed to 

 investigate the Eauna & Elora of the Trias of the British Isles. 

 These Eeports also contain a full list of the fossils recorded from 

 this zone and a bibliography of the fauna and flora by Mr. A. E. 

 Horwood, which has been found of material assistance in the pre- 

 paration of the Bibliography appended to the present paper. 



Eecently, Mr. W. Campbell Smith, E.Gr.S., commenced the 

 mapping of the zone in this and neighbouring areas, in connexion 

 wdth an investigation of the fauna and flora of the Upper Keuper 

 which he and Mr. L. J. Wills are carrying out. Although he had 

 made considerable progress before he became aware that my own 

 map was practically completed, he has most generously left the 

 description of this portion of the ground to me, and has also 

 allowed me to see his maps. Without involving Mr. Smith in any 

 responsibility for the lines on my map, or for the views expressed 

 in this paper, I should like to state that our field-observations 

 coincided closely ; that Mr. Smith had independently discovered 

 many of the additional outcrops now recorded for the first time ; 

 and that I am indebted to him for information about two or three 

 exposures which I had not previously observed, thus enabling me 

 to present a better map. 



IV. Steatigraphy of the Arden Sandstone Geoup. 



In view of the known irregularity of Triassic deposits, and as 

 sandstones are known to occur at several levels in the Marls, it 

 is important that the evidence for showing the Arden Sandstone 



