Measurements of cross-stratification, in total 58, were done to determine the direction of palaeotransport and to study bedform morphology.
The oldest Devonian deposits exposed in the vicinity of the Borschovo Village are siliciclastic ones, such as white sandstones with trough cross-stratification and clay clasts.
Finally, in aeolian dunes the large-scale cross-stratification mostly forms a single set and is laterally discontinuous.
The basal, coarse-grained laminae of a couplet is erosion-ally-based, which enhance the striping pattern parallel to lee face (cross-stratification).
Lithofacies association B is characterized by the interbedding of sandstones, and claystones with plant debris and coal, and is interpreted as being formed by tidal flats based upon heterogeneous stratification, and bidirectional cross-stratification
. Lithofacies association C consists of claystones, coal, and certain sandstones.
It displays abundant, well developed, large scale, cross-stratification
and is the remains of a deflated Pleistocene seif dune created in response to the palaeo-Shamal winds (Kirkham, 1998a).
The limestone is thin to thick bedded, finely crystalline micritic, partly arenaceous and possesses various types of primary sedimentary structures, such as hummocky cross-stratification
, parallel lamination, cross- bedding and longitudinal ridges.
For example, the rather terse section on storm deposits deals at moderate length with the formation of hummocky cross-stratification
, a subject dealt with at length in a separate entry.
, sharp basal contacts, gutter casts and graded beds suggest sedimentation from erosive combined to waning flows (Dumas et al.
The uppermost thick sandstone levels display cross-stratification
generated by hydraulic dunes, indicating palaeocurrents from the W and WNW.
Description: The cross-bedded channel sandstone facies consists of laterally persistent sheets of sandstone, dominated by large trough cross- stratification with subordinate small-scale, planar and trough cross-stratification
In some sections it shows the following upward evolution: parallel-horizontal or slightly undulated (large wavelength) lamination, hummocky cross-stratification
(HCS) of decimetric to metric apparent wavelenght and wave ripple cross stratification (Fig.