"A 4.4 billion-year-old zircon crystal from the Jack Hills region of Australia has been confirmed to be the oldest bit of the Earth’s crust.
To determine the age of the zircon fragment, the scientists first used a widely accepted dating technique based on determining the radioactive decay of uranium to lead in a mineral sample. But because some scientists hypothesized that this technique might give a false date due to possible movement of lead atoms within the crystal over time, the researchers turned to a second sophisticated method to verify the finding. They used a technique known as atom-probe tomography that was able to identify individual atoms of lead in the crystal and determine their mass, and confirmed that the zircon was indeed 4.4 billion years old.” (via Tiny Crystal Is Oldest Known Piece of Earth, Scientists Say - NBC News.com)
Silty sandy turbidite beds within marine shale of the Jurassic Fernie Formation near Banff, Alberta, Canada. Due to differential weathering, the more resistant turbidite siltstone tend to stick out from the outcrop. The beds are part of an overturned syncline. Depositional scouring marks can be seen on the base of the turbidite units. Top (younger rocks) is towards the right.
How the gravity of nature and the silence startle you, when you stand face to face with her, undistracted, before a barren ridge or in the desolation of ancient hills
The beautiful, fully domesticated, Marble Fox.
when you stay up all night doing hw and the teacher doesn’t collect it