Rockhound Ryan Posted November 25, 2022 Share Posted November 25, 2022 Would love to know what species I have here. The trilobites are in a fine grained sandstone or siltstone, approx. 1 to 1.5cm. The plant fossil is in flaky but rigid shale, It did break coming out and you can see my snarge repair job with some black glue. The largest fern frond itself is about 6 to 7 cm but similar smaller impressions are all over the piece, inside in different "layers" of the shale and on the reverse side as well. Trilobites found at Swatera Gap roadcut on I-81 in PA, the fern is found in the Glenshaw Glass RR cut off of Rt. 8 in Etna, PA. (just 7 miles north of Pittsburgh) 2 Link to comment Share on other sites More sharing options...
Misha Posted November 25, 2022 Share Posted November 25, 2022 The trilobites are Elrathia kingii, the location info you have about them seems like a mislabeling as these come from the Cambrian in Utah, not the Ordovician Swatara gap, where the trilobites themselves and their preservation looks very different 2 Link to comment Share on other sites More sharing options...
hemipristis Posted November 25, 2022 Share Posted November 25, 2022 Concur with @Misha. here's a photo of a Swatara Gap trio. They tend to be orange in color due to oxidized iron 1 'Those who cannot remember the past are condemned to repeat it.' George Santayana Link to comment Share on other sites More sharing options...
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