Part polished petrified wood log
225 million years old
This is an ancient tree trunk that has turned to stone.
These ancient trees lived in a region which had a moist and probably warm climate. Washed from upland areas where they grew, the logs accumulated on the delta flats where they where buried by sand and silt and layers of volcanic ash. This ash was the source of silica which helped to mineralize the logs after burial. The logs where replaced by quartz or silica coloured with oxides of iron and manganese.