Limestone is dissolved very slowly over a period of time. Erratics at Norber are boulders of gritstone standing on a plinth of limestone. The boulders protect the limestone from chemical weathering.

Limestone is dissolved very slowly over a period of time. Erratics at Norber are boulders of gritstone standing on a plinth of limestone. The boulders protect the limestone from chemical weathering.

The owner of a limestone quarry above Glenwood Springs has spent several years arguing that its contentious plan for an ...

The weathered limestone boulders that are a feature of Forest Hill were once sediment on the floor of a shallow sea that covered much of what is now Southland sometime between 25 and 15 million years ...