Pinoxylon Dakotense - Rapid City, South Dakota
Posted by: Groundspeak Premium Member flyingmoose
N 44° 04.477 W 103° 12.383
13T E 643622 N 4881724
Quick Description: A display from the Geology class of 1906.
Location: South Dakota, United States
Date Posted: 8/31/2020 12:33:43 PM
Waymark Code: WM132CH
Published By: Groundspeak Premium Member Outspoken1
Views: 2

Long Description:
Pinoxylon dakotense Knowlton is a coniferous wood from the Lakota sandstone of the Black Hills, South Dakota. It has been related to Pinus, but differs (1) in the absence of horizontal resin ducts; (2) in the presence of wood parenchyma; and (3) in the partly araucarian character of the pits on the radial walls of the tracheids. 3. The rays are abietinean, and show marginal elements which resemble tracheids markedly. 4. Protopiceoxylon Gothan is generically identical with Pinoxylon Knowlton, and consequently is synonymous. 5. The rings of growth indicate considerable seasonal variation in climate. 6. This wood, showing as it does features which relate it to both the Abietineae and the Araucarineae, cannot definitely be assigned to either tribe with impunity, owing to our present incomplete knowledge of the early history of the Coniferae. - (visit link)

Plaque at base of Petrified Wood display:
Pinoxylon Dakotense
from the
Lakota Cretaceous
presented by the
South Dakota School of Mines
by the class of
General Geology
May 1906
What kinds of fossils are found here:
This is a display at a school so there are no others in the general area.

Admission Fee: no

Link for more information about this site: [Web Link]

Visit Instructions:

At least one good photo you have personally obtained and a brief story of your visit. Any additions or corrections to the information about the Waymark (for instance, have the hours open to the public changed) will be greatly appreciated.

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