That was my question too? They definitely look like cut logs?

They were living trees in a forest about 218 million years ago. Fallen trees were buried by silt from periodic floods and silica rich groundwater percolated through the logs replacing the wood with quartz. Millions of years for this process to happen. Time varies according to conditions. Thanks for watching

Why do the petrified logs look like someone cut them with a saw? Petrified wood is mostly silica-quartz. The logs are very hard (7.8 on the 1-10 Mohs hardness scale!), but brittle. After petrification, but while the logs were still encased in matrix rock, the logs cracked under stress. As the logs eroded out, from gravity and ice wedging, the cracks widened and segments separated. Silica naturally breaks on a clean angle.