Abstract

Comparison of planar and trough cross-stratification directions from several fluvial formations and modern ephemeral streams shows significant differences in the distribution pattern of the two types of cross-stratification. Trough cross-stratification of all sizes is unimodal, coincident with the channel direction, and has a small degree of scatter. In contrast, planar cross-stratification generally is either unimodal with wide scatter or bimodal with subequal modes at 50 degrees to 60 degrees to both sides of the channel direction. Trough cross-stratification is thus a reliable and precise paleocurrent indicator, requiring relatively few measurements to reconstruct the true channel direction. In contrast, planar cross-stratification must be used with caution, and a relatively large number of measurements are needed to reconstruct the paleocurrent system.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not currently have access to this article.