I have spent my whole life in S.Texas.My family has been in the Conservation Contracting business for 75 years.I ran a Bulldozer for 10 years strait out of High School.Before I changed careers.I have never seen one south of the Balcones Fault or there about.What do you look for ?

They are there ;

1. ..in the search block above, enter SHELL MIDDENS

2... See TEXASBEYONDHISTORY.NET

I am familiar with them . I lived in Naples Florida for a while. Anything 3ft. above sea level. Was a Conch shell midden .I am interested in the area South of US90,North of IH35 and North of the Rio Grande .Thanks

Alrighty, I'll offer a word in case it helps.
Due to local climate, soil ( or lack of ) and flora ( fire wood availability )..true fire rock middens may be very small to non existant ( blown away ) in the south BUT...

Hearthrocks are a good marker ....just a different type of cooking system...Limestone gets a very prominent red
coloration when exposed to high heat.
If you can spot these type of rock 'camps' then look closer for flint flakes.

I found the page on cooking stones . http://www.texasbeyondhistory.net/st-plains/nature/images/cookstone%20.html. It is very helpful thanks . The best luck i have had is following creeks and looking into the banks. I found a cash of guadeloupe scrapers that way. they were about 15ft. down in a 30ft. bank .