Hostname: page-component-78c5997874-8bhkd Total loading time: 0 Render date: 2024-11-14T22:16:01.486Z Has data issue: false hasContentIssue false
  • English
  • Français

An Analysis of the Areal Distribution of Soil Size Facies on the Lower Greensand Rocks of East-Central England by the Use of Trend Surface Analysis

Published online by Cambridge University Press:  01 May 2009

Richard J. Chorley
Richard J. Chorley
Affiliation:
Department of Geography, Cambridge University, England.
Get access Rights & Permissions [Opens in a new window]

Abstract

Progressive fitting of linear, quadratic and cubic partial trend best-fit surfaces to median grain size (X1, in mm.) and percentage of silt and clay sizes (X3) of soil samples taken from fifty locations on the Lower Greensand outcrop between Ely and Leighton Buzzard in east-central England permit up to about 40 per cent of the total sums of squares to be “explained”. The successively higher levels of mathematical generalization of regional soil size distribution indicate a decrease in soil grain size towards the south-east, a disparity between the alignment of the soil facies and the strike of the present outcrop, and the existence of zone of abnormally coarse soil facies just to the west of the line of the rivel Ivel. These three features of the regional distribution of soil sizes are interesting in that they correlate with observations which have been made on the regional distribution of bedrock size facies. Finally, a suggested correlation is made between the local zones of small median grain size and abnormally high proportions of silt andclay soil sizes—isolated as “deviations or residuals” from the fitted regional surfaces—and localities where small admixtures of glacial drift (evidenced by the presence of flints) have been observed.

Type
Articles
Information
Geological Magazine , Volume 101 , Issue 4 , 24 August 1964 , pp. 314 - 321
Copyright
Copyright © Cambridge University Press 1964

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Chorley, R. J., 1964. Geomorphological evaluation of factors controlling shearing resistance of surface rocks in sandstone. J. Geophys. Res., 69, 1507–1516.CrossRefGoogle Scholar
Grant, F., 1957. A problem in the analysis of geophysical data. Geophysics, 22, 309–344.CrossRefGoogle Scholar
Kirkaldy, J. F., 1939. The history of the Lower Cretaceous Period in England. Proc. Geol. Ass. Lond., 50, 379–416.CrossRefGoogle Scholar
Krumbein, W. C., 1959. Trend surface analysis of contour type maps with irregular control-point spacing. J. Geophys. Res., 64, 823–834.CrossRefGoogle Scholar
Narayan, J., 1963. Cross-stratification and palaeogeography of the Lower Greensand of south–east England and Bas–Boulonnais, France. Nature, 199, 1246–1247.CrossRefGoogle Scholar
Rastall, R. H., 1925. The tectonics of the southern Midlands. Geol. Mag., 62, 193–222.CrossRefGoogle Scholar
Rastall, R. H., 1927. The underground structure of eastern England. Geol. Mag., 64, 10–26.CrossRefGoogle Scholar
Schwarzacher, W., 1953. Cross–bedding and grain size in the Lower Cretaceous sands of East Anglia. Geol. Mag., 90, 322–330.CrossRefGoogle Scholar
Whitten, E. H. T., 1962. A new method for determination of the average composition of a granite massif. Geochim. et cosmoch. Acta, 26, 545–560.CrossRefGoogle Scholar
Whitten, E. H. T., 1963. A surface–fitting program suitable for testing geological models which involve areally distributed data. Tech. Rept. No. 2, ONR Task No. 389–135, Contract Nonr 1228(26), Office of Naval Research, Geography Branch, Northwestern University, Evanston, I11., 56 pp.Google Scholar
Woodland, A. W., 1942–1946. Water supply from underground sources. Geol. Surv. of Great Britain.Google Scholar
Wartime Pamphlet No. 4 (The Oxford-Northampton District). General Discussion (April, 1942); Part IV, Well catalogues for NS one-inch sheets 201, 202, and 203 (November,1942); Part V, Well catalogues for NS one–inch sheets 218, 219 and 220 (march, 1943); Part VI, Well catalogues for NS one–inch sheets 236, 237 and 238 (September, 1942).Google Scholar
Wartime Pamphlet No. 20 (The Cambridge-Ipswich District). Part I, Well catalogues for NS one–inch sheets 172, 187 and 204 (December, 1942); Part II, Well catalogues for NS one–inch sheets 173, 188 and 205 (February, 1943); Part X, General Discussion (April, 1946).Google Scholar