Virtual Field Trip—Group 5
Geologic Features of the Holder Formation
Ken Stanley
GPS Location: 13S, 0414457, UTM 3649818
Small “spindle shaped” calcareous marine fossils that resemble grains of rice or wheat. Fusulinids are single cell organisms.
Crystal Cobble
GPS Location: 13 S, 0414417, UTM 3649825
Pennsylvanian crinoids are related to modern day sea lilies. They are members of the echinoderm family. All crinoids are constructed of a single crystal of calcite. In this photo, you can see a single column with a central canal.
Azza Ezzat and Ronda GillespieGPS Location: 13 S, 0414417, UTM 3649825
Visible in these photographs, typical brachiopod have a concave fan-like shape. Each valve of the brachiopod has bilateral symmetry.
Nicole Erdelyi
GPS Location: 13 S, 0414457, UTM 3649818
In this picture, you can see limestone with thin layers of sandstone and shale in a cycle due to a change in sea level. Phylloid algae are very apparent in each of the limestone layers.
Dusti Griffin
GPS Location: 13 S, 0414417, UTM 3649825
This is an example of remains of the phylloid algae that once lived in this area. They appear to have a “potato chip” shape when viewed from the edge.
Robert Tcherneshoff
GPS Location: 13 S, 0414457, UTM 3649818
The conglomerate found on the northern side of the outcrop was formed in an ancient streambed or at a low sea level when the shelf was exposed. There are small “holes” that were formed from more soluble cobbles that dissolved.
Ronda Gillespie
GPS Location: 13 S, 0414457, UTM 3649818
This shelf “sandwich” is created using rocks from each type of layer represented in this outcrop.
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