[SunkenCiv]

I’m no geologist, but the “fortress” looks like natural geology.

http://www.anarchaeology.com/fortress/index.html

OTOH, one of the artifacts from the Texas site does indeed look like it could be Phoenician, or rather Carthaginian.

http://www.anarchaeology.com/quivira/artifact.htm

[ApplegateRanch]

Lacking any scale, and going by appearance alone, I’d guess a concretion formed around a duck’s (or similar) head, rather than an artifact.

Computer chairs are almost as good as armchairs for that kind of ‘field work’.