The Levenshulme Limestones. 295 



^th Group of Limestones. 



The 5th group of limestones succeeds these red marls, 

 and commences with a bed of limestone, 3 ft. 6 in. thick, but 

 with half-inch partings at 6 inches from the base, and at 

 I ft. 10 in. from the base. There was an inch of brown 

 limonite on the surface between the limestone and the 

 hematitic red marl. The limestone had a green shale 

 •coating, and all the crevices were filled with it. A fine fish- 

 eye nodule (coprolite) was found in one of these shale partings. 



The upper member of this group is a very pink lime- 

 stone, which polishes badly, being pitted with small holes. It 

 has an extremely irregular surface, and a thin section shows 

 the same irregularity in the substance of the stone ; wavy 

 lines pass through the mass as in an agate. It is almost 

 •entirely made up of Spirorbis and other small shells, and 

 there are many tiny bones. A section under the micro- 

 scope shews clearly the irregular constitution of this lime- 

 stone. It is all curved lines of deposition, crowded with 

 organic remains. Entomostraca are present in great 

 numbers. It also contains the fish-eye circles, with dark 

 centres. In one of these the central spot was granulated, 

 and contained a pink spot. Red patches are always 

 found with organic remains in these limestones, hematite 

 having been absorbed by the tissues. The Entomostraca in 

 this section are entire, and the cavities filled with crystals 

 of calc spar, which form beautiful objects with the polari- 

 scope. They have been identified as of the Carbonia group. 

 The j{in. power shows curiously jointed tubular organisms, 

 probably Ortona Carbonarice, a tubicular annelid. Another 

 series of variegated marls succeeds this group, about 16 ft. 

 thick — purples, greens intermixed, followed by a bright red 

 hematite band, which is again followed by brown, purple 

 and green marls. These bands are full of the fish-eye nodules, 

 which are noticeable all along the face of the cutting, and they 



