226 THE ESSEX NATURALIST 3O'Brien, Henry (1834). The Round Towers of Ireland. (Buddhist minaret: Phallic symbol.) 4de Poer, Maire & Liam (1958). Early Christian Ireland. (Belfry, possibly refuge.) 5Wise, T. A. (1884). History of Paganism in Caledonia. (Druids' and Eastern Buddhism, carried by the Phoenicians.) 6Zernos, C. (1954). La Sardegne dans l'era Eneolithique, etc. (Fighting Strongholds.) 7Lethbridge, T. C. (1954). The Painted Men (Pictish Brochs). (Defence.) 8Meynell, Esther. Passim. (13th cent. belfries.) 9Petrie, George (1833). Round Towers (Paper to Royal Irish Academy of Dublin). (Belfry and Refuge.) 10Cautley, Munro (1937). Suffolk Churches, and their Treasures. (De- fence and Refuge "without a doubt".) 11Macalister, R. A. S. (1935). Ancient Ireland. (First belfry then defence.) Other References of interest are: Greenwood, G. B. Round Towers in Norfolk, Suffolk and Essex. Essex Review, 46: 162. Hudson, E. W. Round Towers of Great Britain. R.I.B.A. Jul, series V, p. 284. Morley, C. Circular Towers. Proc. Suff. Inst. Arch., 18: 144. Woodward & Gage. Round Towers of Norfolk and Suffolk. Archaeologia, 23: 7, 10. Some Observations of the Superficial Geology of an Area of Western Essex By Raymond E. Chaplin (Passmore Edwards Museum, London, E.15) The writer was able, during 1963, to examine the course of the Esso gas pipeline trench across the Epping, Theydon and Abridge areas. The trench, approximately six feet deep, was examined for geological and archaeological features between the river Roding at T.Q. 488977 and the summit of the Epping Forest Ridge near the Bell Inn at T.L. 448016. The course of the trench is shown on the sketch map (Fig. 1). A profile of the transect with associated deposits is shown in Fig. 2; this was prepared from the O.S. 1/25000 map of the area. All heights quoted in this paper are approximate, being solely derived from map contours. Description of transect The present course of the river Roding above Abridge lies between the 100 foot contours and the valley is about 700 yards across. Its floor consists of a flat flood plain into which the river is incised. The material of the flood plain comprises about three feet of dark alluvial clay overlying river gravel. Towards the edge