A virtual graphic log for clastic sediments

Abstract

Drawing a graphic log is a standard method to describe sedimentary rocks at outcrops or from borehole cores. Graphic logs give a visual impression of the rocks, their lithology, particle size, bedding contacts, sedimentary structures, palaeocurrents and fossil content as well as trends such as coarsening or fining upwards. The format of graphic logs and their styles vary. This paper includes outcrop photographs that were collected as part of a distance learning module in Sedimentology and provides an opportunity for students to practice drawing a graphic log without having to venture into the field, effectively bringing the field into the classroom. Instructions for drawing a graphic log are included. There is potential for virtual logs to provide a more open science approach to outcrop interpretation, enabling researchers to visit outcrops virtually and make their own descriptions and interpretations.