They had been found in Latchford's open iron ore pit in the Arundel Formation at Swampoodle near Muirkirk in Prince George's County, Maryland. Tyson let them be studied by the dentist Christopher Johnston, professor at the Baltimore Dental College, who cut one tooth in half and thereby discovered a characteristic star-formed cross-section.
They had been discovered in Latchford's open iron ore pit in the Arundel Formation at Swampoodle near Muirkirk in Prince George's County, Maryland. Tyson allowed them to be examined by the dentist Christopher Johnston, professor at the Baltimore Dental College, who cut one tooth in half and thereby uncovered a distinctive star-formed cross-section.