Happy birdthday Nicolaus!
On occasion of his 374th birthday, Google devoted today's doodle to the pioneer of stratigraphy: Nicolaus Steno. The design is essential but elegant, and clearly refers to the law of superposition. Indeed Nicolaus Steno pioneered the idea that sedimentary layers are deposited in a time sequence, with the oldest at the bottom and the youngest at the top.
|Today's doodle, devoted to NSteno|
|Geological history of Tuscany, according to Nicolaus Steno. Image from Earth Observatory.|
|In the formative years of geology, fossil shark teeth were named glossopetrae, or tongue-stones, and believed to have magical properties. Steno visually compared fossil teeth to recent ones, from the head of a modern shark.|
Rudwick, M. (1976). The emergence of a visual language for geological science.Hist. Sci., xiv: 149-195