Mesocalamites (Horsetail) 15.2 cm - Poland - Carboniferous
Large section of a Mesocalamites (extinct treelike horsetail) from Upper Silesia, Poland. Dates to the Carboniferous Period (Westphalian "B") - Circa 310 million years old.
Mesocalamites: 15.2 cm x 5.4 cm
Matrix: 15.5 cm x 10.2 cm x 2.3 cm
Weight: 1.01 kg