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Early to Middle Bathonian ammonites of the families Sphaeroceratidae Buckman and Tulitidae Buckman have been carefully examined. Specimens were collected from fine grained sediments, which belong to Middle Jurassic "Częstochowa Ore-bearing Clay Formation" of the Polish Jura Chain. Usually ammonites were found within sphaerosiderite nodules. Nodules were collected from numerous clay-pits...
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