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In siderite concretions from the (now closed) opencast mine Crockhey between Manchester and Liverpool beautifully preserved plant fossils as well as animal fossils have been found. In the quarry coal has been mined, dating from the Upper Carboniferous (Westphalian A). Siderite is an iron compound which is sometimes used as ore.
Below are six extremely fine specimens of the extinct horseshoe crab Euproops rotundatus. Click on the photos for enlargement.
The pictured fossils are from the collections of Andrew Tenny (Smithybridge) and Lee Cherry (Reddish, Stockport).

Euproops rotundatus

Euproops rotundatus Euproops rotundatus
Euproops rotundatus Euproops rotundatus

Euproops rotundatus

Click on the photos for enlargement