Clarence B. Moore, Additional mounds of Duval and of Clay counties… (1896)
“ Another point strongly impressing itself upon us was the almost entire absence of stone (unless coquina [3] may be so termed) in the territory bordering the Halifax, the Hillsboro’ and the Indian rivers, the mounds being entirely free from chips, cores, and other refuse material of chert so abundant in mounds of the St. Johns river.Large fields of shell, denoting aboriginal dwelling sites, are numerous, yet upon them we found not a single arrowhead or fragment of hard stone, while persons cultivating these fields invariably expressed ignorance as to the discovery of stone upon them. ”
