In 1815 he published the first modern geological map, "A Map of the Strata of England and Wales with a Part of Scotland", a map so meticulously researched that it can still be used today.

1815年，他出版了第一张现代地质学地图——《英格兰、威尔士及部分苏格兰地区地层地图》，这张地质地图绘制得非常精确，直到现在仍有参考价值。