Weather Blog Mountains Made of Fossils The peaks in Guadalupe Mountains National Park—some of the highest in Texas—are made of a well-preserved fossil reef formed more than 250 million years ago. Read More… About Author OTW Observer See author's posts Continue Reading Previous: New London weather map shows exact dates ‘mini heatwave’ to hit with 22C temperaturesNext: London Marathon weather forecast and when ‘mini-heatwave’ on the way Related Stories Blast From the Past: A Modern Lake in an Ancient Crater Weather Blog Blast From the Past: A Modern Lake in an Ancient Crater July 1, 2025 A Cosmic Explosion Over Siberia Weather Blog A Cosmic Explosion Over Siberia June 30, 2025 A Dusty Vestige of the Old West Weather Blog A Dusty Vestige of the Old West June 29, 2025