GIGANTIC BIED I'EOM LOWER EOCENE BEDS. 



157 



VI. — Table of Characters of the Tibio-tarsus of Birds. 



Inner condyle prominent 



Inner condjle deeper from before backwards 1 



tban outer J 



Inner condyle more compressed than outer . . . . 



Inner condyle less compressed than outer 



Tuberosities wider than condyles 



Tuberosities narrower than condyles 



Condyles thick 



Condyles compressed 



Lower margin of canal prominent 



Lower margin of canal retreating 



Intercondylar fossa deep 



Intercondylar fossa shallow 



Tendon canal near inner side 



Tendon canal in middle 



Canal of bridge opens on inner side 



Canal of bridge opens in middle 



Intercondylar trochlear edge high 



Intercondylar trochlear edge low 



Lower end of tibia turned inwards 



VII. — Description of Park-Hill Railway Section. 

 The Woodsicle and South-Croydon Branch of the South-Eastern Railway passes 

 through Park Hill, near Croydon, and the cuttings made at that place exposed the 

 series of Lower Eocene beds which have been so carefully described by Mr. H. M. 

 IQaassen in his paper read before the Geologists' Association (Proceed, vol. viii. p. 226, 

 1883). The accompanying geological section (p. 158), kindly lent by Mr. Klaassen, will 

 show the horizon from which the specimens were obtained. A little below the level 

 of the railway-lines at the south end of the cuttings Chalk occurs («), above which the 

 uufossiliferous " Thanet Beds " (b) attain a thickness of 38 feet, and these are suc- 

 ceeded by the " Woolwich and Reading Beds." The last-named formation is made up 

 of several minor subdivisions : — First the " Bottom Bed " (c), which is about 15 feet in 

 thickness, and includes several beds, differing in colour, but all more or less sandy, 

 the lowest of them being of a brown tint, and containing Ostrea bellovacina as well as 

 Sharks' teeth in some abundance. The next beds, of grey, greenish-brown, and green 

 sands, were a well-marked feature when the cutting was first made ; the bright-green 

 bed being especially striking, as it could be clearly seen along the whole length of the 

 southern part of the cutting. The " Lavender-coloured Band " {d), about 18 inches 

 thick, marks the upper limit of the " Bottom Bed," and is succeeded by about 20 feet 



