**5.4 Reynolds particle number (Rep)**

To collaborate inferred sediment transport modes, the particle Reynolds particle number, Rep, was additionally calculated as:

$$\mathrm{Re}\_{\mathbf{p}} = \sqrt{\mathbf{R} \,\mathbf{g} \,\mathrm{D}\_{50} \mathbf{D}\_{50} / v}$$

And plotted Rep as a function of τ\*, following [39] (**Figure 3**). This plot enable field results to be contrasted with data that are typical of either bed load, mixed load and suspended load sediments [39], and to identify where these data are positioned among characteristics flow regimes (no sediment transport, ripples and dunes, upper plane beds) following ref. [40]. Using the statistical package **VCALC** the value of Reynolds number (Rep) comes out to be 79.957 and 49.415 for the coalfields of southern part and decreasing to 29.573 to 16.975 in the coalfields of northern part of Rajmahal Gondwana master basin

#### **Figure 3.**

*The graphic plots of Reynolds particle number (Rep) as a function of Shield stress (τ\*) for all coalfields. For comparison, this plot includes secondary data originally compiled by ref. [39].*

*Analyzing Sedimentary Rocks to Evaluate Paleo Dimensions and Flow Dynamics of Permian… DOI: http://dx.doi.org/10.5772/intechopen.106994*

and corresponding sediment fall velocity in the range 0.1110–0.0485 m/sec. When these calculated values are plotted in **Figure 3** indicate that mostly Barakar sediments were deposited in dunes and ripple flow attributes corroborating outcrop field study.
