SOME PROBLEMS RELAT ING TO THE MINERALOGY OF SEDIMENTS*t

ABSTRACT: After a brief account of the work currently in pro-gress on fine-grained sedimentary ocks in the U.S.S.R., and particularly in Azerbaijan, the concept of finely-dispersed minerals as against clay minerals is considered and some comments made on classification schemes. Conditions of formation and deposition determine whether sedimentation r diagenesis i predominant and hence the mineralogy of the deposit. Methods of mineralogical investigation are as yet ill-developed and much remains to be done. Finally, some of the wider problems in clay mineralogy are discussed and some suggestions made regarding the organization ofsuitable studies, particularly in the U.S.S.R