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I recently returned to hunt at my local Culpeper Basin creek site, and although the hunt was not incredibly fruitful, I did run across an interesting specimen. I have walked by this particular oddity many times and did post an image of it in my original trip report, but I remain very curious as to what this might be - if it is anything at all. To add some background information, I believe that the majority of the rocks exposed fall within the Balls Bluff Siltstone member of the Passaic Formation. All fossils that have been recovered thus far from the locality have been plant fossils, which may increase the likelihood that the specimen has a floral origin if it is a fossil at all. Here are a few different photographs of the specimen in question: I apologize if some of the photographs are not the clearest; unfortunately my phone camera tends to make the images noticeably less focused when I zoom in. Unfortunately, I forgot the specimen at the site when I left , but if more photographs are needed I would be happy to fetch it, scrub off the algae and dirt, and upload better photos to this topic. Hopefully it is possible to determine what this is, but it may be somewhat difficult since it seems quite water-worn like many of the rocks present at this particular locality. @cck, @Fossildude19, have either of you seen something like this elsewhere in the Culpeper Basin or elsewhere in the Passaic Formation? Thank you in advance to those who comment on this post.

Hello everyone, Recently I visited a golf course in Falls Church, Virginia - Fairfax county for any who are not familiar with that particular city. I recognized that I was likely to be on Culpeper Basin strata and noticed that there were numerous decorative boulders around the course. Due to their size I suspected that they had probably been sourced locally, and I took the opportunity to see if any might contain fossils. Although many of the boulders matched the Balls Bluff Siltstone rocks that I have encountered in my local stream site, I knew it was a stretch to hope for fossils and I kept my eye out mostly for carbonized plant fragments. After a while, I came upon one boulder that did not look radically different from those I had seen before - until I took a closer look. The boulder contained abundant impressions of what appear to primarily be brachiopods but which could also include some bivalves. Below are some photographs that I took of some of the larger fossils: Impression #1: Looks to be a brachiopod impression though I am not experienced enough in this area to rule out bivalve. Impression #2: Brachiopod? at the top right of the photograph and assorted material. Impression #3: Impression #4: Impression #5: Additional photograph of the boulder (apologies for lack of scale): Since it was a boulder I could not collect the specimen. As such, I cannot take more photographs of the boulder. Considering the fauna present on the piece I highly doubt that it came from the Culpeper Basin - as far as I know Unio sp. is the only bivalve known from Culpeper strata and to my eye these more closely resemble brachiopods. If they are not from the Culpeper Basin, where might the rock have been sourced from? The nearest Devonian-aged formations are the Mahantango and Foreknobs formations with the Needmore Shale being a bit farther away. Do the fossils or the rock resemble what one might expect from one of these formations?

I found this near the 476 turnpike where they tore up all the ground and exposed the New Brunswick Formation. This formation is triassic. I went to a dump site where the construction company took all the rock. Is this possibly some sort of trace fossil from a lizard or sphenodontid? (If you neer to see it better flip your phone or device upside down)