Note 29 — Chapter XV
Reading edition
I found graywacke in sitû at Iron River, in Lake Superior, in 1826, and subsequently at Presque Isle River, where it is slaty, and fine even grained, and apparently suitable for some economical uses.
Reading edition
I found graywacke in sitû at Iron River, in Lake Superior, in 1826, and subsequently at Presque Isle River, where it is slaty, and fine even grained, and apparently suitable for some economical uses.