Mahantango eye openers

[GordonC]

Thanks, I'm baffled by these except what looks like a Dipluera cephalon partial , last photo. Collected yesterday, near Milford Pa. Gordon

Below, these part of a single piece. Closeup of pattern

Two views below

Note center horizontal segmented

Partial cephalon

 

 

[Jeffrey P]

The middle photo is a Dipleura thorax and pygidium and I agree that the bottom photo is a partial Dipleura cephalon. The others I'm not sure about.

[piranha]

The trilobites are all Dipleura dekayi.  The others appear to match with: Fenestella cf. emaciata

 

 

Ellison, R.L. 1965
Stratigraphy and Paleontology of the Mahantango Formation in south-central Pennsylvania.
Pennsylvania Geological Survey, Fourth Series Bulletin, G48:1-298

 

 

4-8 Fenestella cf. emaciata Hall
4. External mold of back of zoarium having relatively large fenestrules; x2.  Upper part of upper shale member at New Bloomfield.
5. Extemal mold of back of zoarium; x2.  Upper shale member at New Bloomfield.
6. External mold of back of zoarium showing subrhomboidal fenestrules and fine longitudinal striae; x5. Upper part of upper shale member at New Bloomfield.
7. External mold of front of zoarium, and molds of subrectangular to subrhomboidal zooecia; x5.  Upper part of upper shale member at New Bloomfield.
8. External mold of front of zoarium, and molds of subrectangular zooecia; x5.  Upper part of upper shale member at New Bloomfield.