Timur, I would say that really depends on the geomorphological structure you're looking at. For instance when looking at a fluvial meandering channel belt you could be pretty sure you're dealing with a sand body. But when you're in a more estuarine environment it becomes more difficult, it could be either sand or clay or mixed sediments. 

The following paper of Van Heteren et al. 2014 might be of your interest. "Reconstructing North Sea palaeolandscapes from 3D and high-density 2D seismic data: An overview"

Article Reconstructing North Sea palaeolandscapes from 3D and high-d...

Dear Mr. Fayzullaev,

one answer has already addressed the problem. What type of surface do you deal with? Is it the interface between lithology and a permanent water body or is it the interface between the atmosphere and the lithosphere with its various subtypes (e.g. pedosphere)? Subaerial geomorphological processes show an outward appearance different from those of subaquatic and as such the results you may expect are certainly very different and hard to be compared with each other. There are numerous block-diagrams published in books and papers on sequence stratigraphy. To test the quality of these block-diagrams is mostly done by 1-D subcrops (wells). In an subaerial environment you have 2-D and 3-D proofs. In subaquatic environments the geomorphology is strongly impacted by the hydrographic regime. A special type or subtype is the "drowned subaerial geomorphology" where you might have direct connections with the 2-D and 3-D situation on land.

We used slope inclination, slope gradient and slope morphology for combined geomophological-geological  studies. Maybe the paper attached can provide you with some ideas and can be of assistance in both geomorphological settings.

Good luck !

H.G.Dill

Sometimes you can know the nature of lithology or the bedrock or some formations from the nature of the weathered surface covered these rocks i.e. if the formation mainly consists of marl or chalk you will get gentle slope on the other hand if you look to areas rich in chert fragments or  a chert pavement on the surface you expect the subsurface formation is rich in chert beds. In general the hard rocks reflect steep slopes while  soft lithology show gentle slope. The composition and type of soil reflects the nature of the bedrocks below in many cases......

Yes, it is possible mostly the lithology which contains clay are prone to erosion. The role of gradient and environment is also very important. in 3 D seismic the lithology can be predicted, You need wireline log which will be converted into synthetic seismogram  by sonic and density logs or alternate method is through geological model 

Dear colleagues,

Thank you for your time answering my question.

Let me highlight some key geological settings:

- it is an extensional setting on the edge of big fault complex forms set of linked half-grabens

- syn-depositional normal faulting creates syn-rift sedimentary sequences 

- the erosive interface I observe is within the syn-rift sequence - rotated fault blocks basin infill 

- submarine environment, most likely outer shelf

- according to interpretation erosion is due to hyperpycnal flows.

Dear:

I see to know the conditions of lithology of the surfacs, and know eroin factore are working  on this surface, and then, stugy the Geomorpholohical process on hard rocks and soft rocks, see the results, mecanical erosion or Chemical erosion, or together, Lithology is very important  factor in this matter.

greeting

yes