Geoscience Reference
In-Depth Information
6
(
(
(c)
(e)
(d)
(f)
Figure 6.3
Paired photographs of sedimentary structures taken from orthogonal faces. (a) Cross-stratifi cation.
Note that from this one view it is impossible to tell whether it is trough or planar stratifi cation. (b) This is from the
same bed as (a) and shows distinct troughs indicating that (a) and (b) are part of a trough cross-stratifi ed
deposit. (c and d) Hummocky cross-stratifi cation (HCS) showing that the structure is similar no matter which
section is viewed. (e)
Diplocraterion
burrow showing the plan view of this vertical burrow. The circles are the top
of the tubes and the lines joining them are the disrupted sediment in between. (f) Cross-section view showing the
vertical U-tube and spreiten. This view is more typical of that illustrated in the literature. Figure 5.4 (p. 86) shows
an idealized cross-sectional view of
Diplocraterion
. (a-f: Angela L. Coe, The Open University, UK.)
