Possible Clues:

• Natural chipped flint
• Crude Tertiary stone
• Chipped stone
• Cultivate briefly, beset by weed and turning over flint
• The oil for an early stone implement
• Very early stone implement to be found in the oil
• Old implement - it's buried in hole possibly
• Old stone implement, one carried by 28 when travelling
• Flint artefact? More than one may be found in the soil
• Prehistoric stone tool