Not sure if this merits further look... But here’s an interesting article I found from 1918. The location described is not far from Cahoki, and this entire area was at one point a Mecca for Native Americans, so it is possible the skeletons were Natives, but for what it’s worth:
ROXANA - SKELETONS OF INTELLIGENT RACE FOUND
Source: Alton Evening Telegraph, May 11, 1918
101 years ago
[madison.illinoisgenweb.org]
Mod Edit > Copyrighted Text replaced with original author’s link/Dr. Troglodyte/GHMB Moderator
(From: “A burial place of the original old settlers…”through: ”…the remains of Native people ended up in a St. Louis or Springfield, Illinois museum.“)
ROXANA - SKELETONS OF INTELLIGENT RACE FOUND
Source: Alton Evening Telegraph, May 11, 1918
101 years ago
[madison.illinoisgenweb.org]
Mod Edit > Copyrighted Text replaced with original author’s link/Dr. Troglodyte/GHMB Moderator
(From: “A burial place of the original old settlers…”through: ”…the remains of Native people ended up in a St. Louis or Springfield, Illinois museum.“)