510 MESSRS. WHITAKER AND JUKES-BROWNE ON [Aug. 1 894, 



At 790. Soft, fine-grained, greenish-grey micaceous and glauconitic 



sand. 

 At 800. Hard, grey, siliceo-calcareous rock. Under the microscope 

 this was found to consist of sponge-spicules replaced by calcite, 

 with scattered grains of quartz and of glauconite and a few 

 foraminifera. There are also many glauconite-casts of 

 spicular canals. All these ingredients are cemented together 

 by crystalline calcite, which is made opaque by a previously 

 existing matrix of finely granular calcite mixed with fine, 

 amorphous, inorganic material. Silica occurs throughout the 

 slide, and in open spaces where it can be well viewed it appears 

 to be both colloid and chalcedonic. Colloid globular silica is 

 also present, but in patches scattered through the field of the 

 slide. 

 At 808. Fine grey sand, with much mica and small grains of 



glauconite. 

 At 810. Compact, grey, calcareous sandstone, with glauconite and 



mica. 

 At 811, 813, 814. Soft fine sand, grey, micaceous, and glauconitic. 

 At 816. Hard, compact, dark-grey, sandy limestone, enclosing 



numerous small grains of glauconite and of mica. 

 At 818. Grey calcareous limestone. Mr. Hill finds that this con- 

 sists chiefly of calcite, partly in minute crystals and mixed with 

 a small proportion of inorganic matter to form a matrix, partly 

 in larger separate crystals. With these latter are grains of 

 quartz and of glauconite, a few foraminifera (Globigerina and 

 Textularia), and a few spheres, but no colloid silica. 

 At 819. A friable, grey, sandy and glauconitic marl. 

 At 825. A fine calcareous sandstone with large glauconite-grains. 

 This is similar to the last, but differs in having more glauconite 

 in larger grains. 

 At 836. A dark-grey, silty, and slightly calcareous clay. The 

 microscope shows this description to be correct. There is 

 much fine inorganic material, some fine quartz-sand, and some 

 fine calcareous matter ; no glauconite. A similar sample comes 

 from 840 feet. 

 At 844. A clean, smooth, unctuous clay. 

 At 850. A somewhat silty grey clay. 



Eight samples between 860 and 914 are ordinary, clean, grey 

 Gault clays. 



At 925. Hard grey clay, with phosphate-nodules and some small 

 specimens of Inoceramus concentricus. 

 928 to 980 (eight samples) are compact grey clays. 

 Mr. Francis informs us that there was at or near the base of the 

 Gault (980| feet) a layer of dark sand like that at Ware. One of us 

 has also seen a sample of phosphatic nodules and broken belemnites 

 coming from 980| feet, so that there can be little doubt that the 

 basement-bed is like that at Richmond and at Meux's, namely, a 

 nodule-bed with greensand above. 



