A. R. Horivood — Upper Trias of Leicestershire. 117 



showing that the bed clips to the south-east. The Eed Marl is similar 

 to the lowest layer at Barrow's pit (west of tlie Midland Eailway). 

 The skerry band resembles the dolomite band at Yass's pit. Seen in 

 section the anastomosing veins of gypsum terminate abruptly with 

 broken ends, crossing and intersecting at all angles. Some larger 

 veins stand out more prominently. 



In a disused pit near the Victoria Road, Humberstone, 11 ft. 9 in. 

 to 18 ft. 6 in. of Eed Marl, with -green marls and skerry and two 

 bands of gypsum, is seen. The gypsum is here occasionally coated 

 with selenite crystals. The ball gypsum contains cavities filled with 

 Eed Marl. One thin laminar piece of gypsum was embedded vertical^ 

 in the Eed Marl, with a pitted and decomposed surface. One piece 

 had a line of oblique cavities at intervals on the uppermost part. 



At the Gipsy Lane Pit there is a fine section from Ehsetics 

 downwards: 15 ft. 3 in. of Tea-green Marl, witli seven nodular 

 bands overlying Eed Marl, skerries, and gypsum, 69 ft. 9 in. to 

 77 ft. 9 in., or nearly as deep as the Glen Parva section, but 

 beginning lower down and so carrying on the sequence. Moreover, 

 it is the nearest available section of these beds to Leicester. The 

 Tea-green Marls are not so green as at Glen Parva. The same 

 courses of nodular calcareous marly bands as at Glen Parva, where 

 fish occur, are seen. The whole formation is much more calcareous. 

 The supposed discolouring of the Tea-green Marls from red to green 

 or grey does not obtain here, since the Ehsetic beds are of no 

 thickness. There is no bone-bed, and the Black Shales are not 

 characteristic. The variegation of the Eed Marls below the Tea- 

 green Marl here is well shown. In fact, this is the best section in 

 these upper beds. The Eed Marl varies in colour from pure red to 

 brown or chocolate. In places it is pink, especially where in contact 

 with green or white bands. It is often coated with powdery oxide 

 of manganese, and the faces of the nodular structure are spotted 

 black with the same. The Eed Marl is usually nodular, and at this 

 horizon is seldom shaly or laminated. It does not assume a loose 

 sandy character as at some adjacent exposures, except at the base. 

 The red bands are parallel with the green or white, witli some 

 exceptions. The green bands are made up of marl or skerry, or 

 gritty sandstone. There is a preponderance of these narrow bands 

 alternating with the red bands at this horizon. One band is especially 

 thick and well-marked at 10 feet {circa) from the top. It is on the 

 laminae of this that the ripple-marks seen in situ (north-west by 

 south-east to north by south) occur. While the Eed Marl consists 

 very largely of fine quartz-diist, etc., and is but slightly calcareous, 

 the green skerries, which also have a greater specific gravity, are 

 much more calcareous, and the separate particles are larger and more 

 varied in composition. Large grains of pink felspar, with others 

 white and decomposed, are common. Many of these bands are largely 

 dolomitic, and, as at Yass's pit, are full of cavities. The skerry bands 

 show evident laminae and lines of stratification, and are not nodular. 

 There are lines along which the particles are graded into different sizes. 



The gypsum is of four types — (1) thick-bedded, tabular, compact, 

 often impure, and streaked Avith marl ; (2) ball gypsum, plano-convex 



