Something very drastic must have taken place. Could it be that there was just not enough room in the beautiful Frijoles for two groups of people who spoke different languages? It was easily a prize spot. It was a green valley—a perfect place to live and the water supply was constant. It might have been the envy of Indians for many miles around. There was not this constant water supply either to the north or to the south. Some groups living on the high mesas might even have depended on open basins hollowed out of soft rock to catch the rain water. Great jealousy could have arisen between individuals or even groups. And one might safely guess that love affairs were broken up between Tewa maidens and Keres boys or vice versa. And who can say with certainty that the Tyuonyi was not the earliest known home of the Keres-speaking people in this vicinity? Or that it was not the Tewas from the north who did the encroaching and forced their way into the Valley of the Frijoles and lived and traded pottery with the Keres? By the time of the fifteenth century, there were many of the Indians living to the north of Tyuonyi. Little house sites were being abandoned. People were drawing closer together to live in larger communities. Surely, the soft volcanic ash from the cliffs was being fashioned into building blocks with stone axes. Some were square, some were rectangular—long heavy four-sided blocks. It had taken Indians years and years, possibly, to learn that this soft stone could be quarried and then shaped. These blocks were definitely better and single thickness coursed masonry walls were in vogue by this time. This was the highest type of prehistoric pueblo architecture on the Pajarito Plateau.