Cherry Creek bed

This gallery contains Cherry Creek thundereggs which were found by Jason Hinkle and Ed Pieters some years ago. The ‘bed’ was originally located by Jason. I was told untill now only surface eggs were collected.

The Cherry Creek eggs are interesting and unusual compared to ‘normal’ eggs. Many eggs have a flat shape and also the wraths (spherulites) attached at the eggs outside are flattish. Some of the eggs I have, do show a clear pattern of flowlines caused by the flowing lava; in some cases very curvy. Cherry Creek eggs with flowpatterns mostly have a fissure-like cavity, just if gas opened up a long shaped cavity inbetween the flowlines. Other eggs have irregular shaped thunderegg cavities and the shell seem to consist of many tiny conglomerated grey dots .

Magnified under a microscope the grey dots do not have sharp boundaries like snowflakes in for example Donnybrook thundereggs, but the structure of them are sometimes very much alike. Socalled snowflakes occur as inclusions in a thundereggs shell and form the nucleationpoint which around a thunderegg formed.

The grey parts in the flowlines of some eggs seem to be strongly compressed ‘trains’ of these grey dots. Maybe the mass-multiple grey dots (mostly not larger then one mm) did prevent forming cavities shaped as usual in thundereggs (more or less starshaped I mean).

The mass-multiple grey dot eggs do sometimes have many small cavities ordered next to each other in a way that implies the lava was still moving while they were being formed.
Other  larger cavities probably were many smaller ones which connected by the persisting opening of these cavities; their walls were just torn apart. Some of the former walls are visible as the ragged fragments vertically hanging/standing.

The ‘conglomerated multiple nucleation point’ eggs seem to form a distinct group within lithophysae. Other localities where eggs with the same habit were found are Soldiers Farewell and Opal Mountain Flat bed (both CA) and a particular unnamed bed near Aurora (NV).