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Plant - Pteridosperm

A fossilised pinnule from a Cylcopteris sp. pteridosperm plant (parts a and b) which is preserved in an iron stone nodule. This is the remains of a seed fern. The pinnule is dark grey in colour and fairly well preserved. It is almost square in shape with one flat side. The one half of the nodule forms the cast and the other half forms the mould. The matrix is made up of a brown fine grained sedime…