|
The Rocky Creek glaciation dates back to the Carboniferous period (290 million years ago) so a substantial amount of erosion has taken place.
Accordingly the best areas to view the fluvio-glacial conglomerates are down by the running water where you have a number of nice polished surfaces.
What you are looking for are the areas that look similar to the “pebblecrete” used in modern landscaping.
Also in this area you will find Varve or Varve shale which forms exclusively in the beds of glacial lakes. This you will find among the loose stones deposited by the creek on the shoreline. It is a dark stone with layers and the occasional pebble embedded into it.
Varve is like a window back in time as the layers can tell you a lot about its formation. The thicker layers were formed over summer (when the glacier was melting) with a thicker than normal band indicating a longer hotter summer. The very fine layer is formed over winter when the lake is frozen over and only the fine sediment settles.
|