chert

The water was ice-cold and filtered through the chert and limestone of the country and tasted as though civilization was still something in the future.

To other chert samples, they added sulfur-containing “biomorphs,” spheres and filaments made of tiny crystals but shaped like bacteria.

Cosmidis, Nims and colleagues added sulfur-containing bacteria called Thiothrix to solidifying chert to see what might happen during actual fossilization.

And because the place where they made fires was found, these mountains are called Aw-up Chert-taw to this day.

Most examples from this area are made from Ft. Payne chert, which is usually patinated to a chocolate brown color.

Points were made from Ft. Payne chert, Bangor nodular flint, jasper or other local materials.

Some examples made of Ft. Payne chert show considerable patination.

Most examples are made of Ft. Payne chert but other local materials were also used.