Sympo. 
Some of the data presented is extracted from the 
interpretation work carried out at N.B.R.R.I. in 
connection with the project, "Preperation of 
engineering geological map of Nigeria" and other is 
of my earlier work at Central Road Research Institute, 
New Delhi (India), thankfully acknowledged. 
BIBLIOGRAPHY 
Allen, P. E. T. 1979. The use of side looking 
airborne radar. (SLAR) imagery for the production 
of land use and vegetation study of Nigeria UN/FAO 
training seminar on remote sensing of earth 
resources, Ibadan (Nigeria). 
Beaumont, T. E. 1979. Remote sensing for the 
location and mapping of engineering construction 
materials in developing countries. Q. J. Enginee 
ring Geology. 12 s 147 - 158. 
Lawrence, C. J. 1984. Remote sensing in the search 
for calcretes in Botswana, Overseas unit, Transport 
and Road Research Laboratory, U. K. Proc. eighth 
regional conference for Africa, Soil mechanics and 
foundation engineering, Harare (Zimbabwe). 
Madedor, A. 0., Nanda, R. L., Akinyede, J. 0. 1984. 
Engineering soil and material survey with remote 
sensing technique. Proc. eighth regional conference 
for Africa, Soil mechanics and foundation engine 
ering, Harare, (Zimbabwe). 1:23-32. 
Nanda, R. L. 1969. Application of air photo inter 
pretation for engineering soil survey, Indian 
Roads Congress, Bull 13, 62 - 82. 
Nanda, R. L. 1970. Survey of Road Construction 
Materials in Rajasthan through aerial photographs, 
Jr. Indian Roads Congress, 33 part - 3 
Nanda, R. L. 1982. Survey of road construction 
materials through aerial photographs for future 
road development programme in India. International 
seminar on impact of aerial survey on National 
Development, held at Regional centre for training 
in aerial surveys, lie - Ife (Nigeria). 
Nanda, R. L. and Akinyede, J. 0. 1985. Application 
of remote sensing for the survey of calcrete in 
semi-arid region of Nigeria. Proc. eleventh 
International conference on soil mechanics and 
foundation engineering, Sanfrancisco (U. S. A.), 
4 : 2447 - 2452. 
Natterberg, R. 1978. Prospecting for calcrete road 
materials in South and South West Africa. Jr. 
Civil engineer, South Africa, JAN (Die Siviele 
inginieur in Suid Afrika). 
Nigerian Building and Road Research Institute.1983. 
Engineering soil and materials surveys in parts 
of N. E. Nigeria, Annual Report. 
Nigerian Building and Road Research Institute. 1985. 
Identification and location of road building 
materials in North East Kano State, consultancy 
report, B.R.R.I./TE/l. 
RIB, H. T. 1982. Examples of remote sensing appli 
cation to highway engineering. Proc. second 
national workshop on engineering application of 
remote sensing, Canada centre for remote sensing, 
Ontario, 99 - 104. 
Uppal, H. L. and Nanda, R. L. 1968, Survey of 
hidden calcrete in alluvial plains of India by 
air photo interpretation. Proc. Forth conf. 
Australian Road Research Board, 4: 1677 - 1688. 
Remo 
Explo 
prospi 
E.O’Con 
British Gee 
ABSTRACT: 
in the pie 
targets fc 
Administre 
Precambria 
No basemap 
basemaps a 
photograph 
LANDSAT ha 
and panchr 
and mappin 
Interactiv 
ratio comp' 
different 
(Gems systi 
The result: 
mineral pr< 
fracture s; 
discoveries 
silica caps 
del Tigre ] 
650 
À