Hey everybody, on my most recent excursion in the Hell creek formation ear the powder river in montana. I found some pieces of weathered out bone all in a 5 foot radius of each other on a small rise. Due to changing weather and approaching night I didn't have the chance to uncover anything else so I grabbed the weathered out pieces and will come back to the site in August.
I am a beginner and am honestly stumped as to what these could be. The 2 largest bone fragments measure 22x10.5x2.5cm and 12.8x7.3x2.9cm respectively. I am inbetween chunkasaurous or a possible ceratopsian frill. But I