How deep should we look for evidence of first Americans? By Bill Young Three sites in Texas have been discovered and at least partially excavated in the past 15 years yielding evidence of at least one culture older than Clovis. Most of the Clovis sites have been firmly dated to around 12,500 to 13,000 years ago. Not only did these Clovis sites yield projectile points of the very distinct Clovis type, the sites also yielded true blades and very large well- made thin preforms diagnostic of only the Clovis people. The archeologists who have worked at some of these Clovis...