Arrow head dating

Discovered by experts from Archaeology South East, the finds have now been recorded and analysed and are already extending our knowledge of a well-known site."We are delighted to have discovered more of the abbey’s history during the course of this project," said Paul Roberts, English Heritage Inspector of Ancient Monuments.

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Only C-14 is radioactive, the other two are called "stable isotopes." C-14 forms from nitrogen-14 in the upper atmosphere by cosmic radiation from the sun.

This radioactive form of carbon reacts with oxygen to form carbon dioxide, a gas in our atmosphere. Animals eat plants, and some animals eat other animals, so a very small part of living bodies is made of radioactive C-14.

Shortly afterwards, William had a church consecrated on the site and it is the west end of this monastery church that archaeologists believe they have found.

This builds on the discovery two years ago of the church’s inner walls.

Osborne speculated that the rare arrowhead probably was crafted from a sacramental wine bottle, which must have struck the Indian craftsman as marvelous new ammunition material.

Seven flint arrowheads were discovered early in the dig, which began three weeks ago.The floors surprised archaeologists because maps of the period show open areas where the building used to stand."The Spanish missionaries were meticulous record keepers, so we can assume that this building was demolished before the Battle of the Alamo,"Denton said.An Austin archaeological team was commissioned by the Alamo's caretaker, the Daughters of the Republic of Texas, to carry out exploration of the area around the Alamo gift shop, where the group plans to expand the basement storage and dig a tunnel to a proposed freight elevator next to Houston Street.Mark Denton, staff archaeologist with the State Antiquities Committee, said that when exploration of the area began, it was unknown whether any significant artifacts had survived the generations of Alamo tenants who had "churned up the soil." "I never would have believed such extraordinary deposits from the mission period would be found," Denton said.Projectile points are tips fastened to the ends of spears, darts, and arrow shafts.

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