356 Geological Society. 



latiou of such vast quantities of dead shells on the East Anglian 

 margin of the North Sea at that period can be suggested. At the 

 present day, the eastern shores, of Norfolk and Suffolk are almost 

 destitute of such debris. 



Mr. J. Lomas, in his Eeport on the Inorganic Constituents of 

 the Crag, states thatlithologically the various subdivisions of the Red 

 Crag are the same. Differences of colour may be traced to definite 

 lines of flow along which water containing ferruginous matter has 

 moved. 



Among the rarer minerals separated out by high-density fluids, 

 zircon, rutile, cyanite, ilmenite with leucoxene, garnets, andalusite, 

 corundum, tourmaline, muscovite, biotite, glauconite, orthoclase, 

 labradorite, albite, and microcline are found. In the heavy fractions 

 red garnets are very common. Tourmaline occurs abundantly, and 

 includes green, blue, yellow, and brown varieties. Muscovite pre- 

 dominates over biotite, and often includes rounded crystals of 

 zircon, rutile, etc. Eerro-magnesian minerals, with the exception 

 of biotite, are absent. Glauconite is very plentiful, and frequently 

 retains the form of the organisms of which it has formed casts. 



In the Norwich Crag the same minerals are present, but musco- 

 vite is found in excess. The Chillesford Sands differ from the Crags 

 only in the absence of glauconite. The bulk of the material of the 

 beds described consists of well-rounded grains of quartz, seldom 

 showing traces of secondary crystallization. Flint occurs as large 

 pebbles, and fine angular chips are met with in the sands. 



2. ' A Description of the Salt-Lake of Larnaca in the Island of 

 Cyprus.' By C. V. Bellamy, Esq., E.G.S., Assoc.M.Inst.C.E. 



After a brief description of the general geology and geography of 

 the island, the author proceeds to deal with the topography of the 

 Lake, which occurs in a basin shut off from the sea, its deepest part 

 being about 10 feet below sea-level. The barrier between the salt- 

 lake and the sea is made of stiff calcareous clay associated -with 

 masses of conglomerate resting on plastic clay, that on watery mud, 

 and that again on stiff calcareous clay. The sea-water appears to 

 percolate through the highest deposits, meeting with checks in the 

 conglomerates, and thus reaches the basin somewhat slowly, where 

 it is evaporated to dryness by the summer heat and deposits its salt. 

 Artificial channels have been made, to carry the flood-water from the 

 laud direct to the sea, so that it does not dilute the brine of the 

 lake. The rainfall in the catchment-area round the lake is at 

 the most only enough to supply 223 million gallons, and as the lake 

 contains 480 million gallons when full, the balance of 257 million 

 gallons must be derived from the sea. The lake is probably situated 

 on what was. an extensive arm of the sea at the close of the 

 Kainozoic era. The salt-harvest begins in August, at the zenith of 

 summer heat, and it is reported that a single heavy shower at that ; 

 time of year suffices to ruin it. Observations are given on the 

 density of the water, the plants and animals in the water, and the 

 lake-shore deposits. '. ;. .... 



