In this contribution we describe various scientific techniques, which were used during the research of a multigeneration slope deformation on the archeological Celtic site of  “Obri Hrad” near Kasperske Hory (SW Bohemia). Due to a specific local condition, practically no accumulations were left, thus we had to work with other, mostly indirect signs and traces of the older generations of the slope. We have used methods of geomorphology,  of engineering geology and geophysics, and last but not least, of X-ray diffraction analysis which has helped to determine the origin of morphologically unclear accumulation remnants.The X-ray diffraction analysis was performed on the samples collected along selected profile. The method was employed in order to validate a hypothesis that the remnants of the accumulation on the right bank of the river are accumulations of a slide, originating on the left bank of the river. In total we have analyzed 11 samples, but one sample (No. 7) was omitted – it has too biased powder pattern, probably due to the weathering. In the samples were qualitatively and semiquantitatively determined a-quartz (33-1161), muscovite 2M2 (25-649), muscovite 2M1 (6-263), muscovite 1M (7-25),  microcline (19-932), orthoclase (31-966), biotite 1M (42-1437) and sillimanite (38-471).If we project the results into the profile, interesting features can be observed. Generally, it can be said that samples 3-5 from the center of the slope are very much alike, and they are also very similar to sample 6, which was taken from the presumed slide accumulation. The sample No. 11 is also similar, particularly due to the presence of the sillimanite. The content of biotite 1M differentiates the samples No.8 and No.9. The projection into the profile might suggest a logical conclusion that the mineral content changes not only horizontally, but also vertically with the respect to the foliation planes.  

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