It's #ScienceWeek Downunder and #GeoscienceAustralia has a #geoscience education display at the Woden Plaza for the weekend.

The displays explain how #EarthScientists use the properties of rocks like magnetism to map what is deep underground to better understand the #geology. Also a very cool display about the rocks in #Minecraft.

No idea how many of you are locals in beautiful #Canberra, but go have a look if you can!

The Great Unconformity

Left to right on top of my notebook are:
Tapeats Sandstone deposited 525 million years ago in a beach environment.
Zoraster Granite emplaced 1.7 billion years ago.
Vishnu Schist 1.8 billion years ago.

Both of the bottom layers are the roots of mountains that eroded away.

Right where my foot is, the contact between the Tapeats and the Zoraster, there is over a BILLION years missing in the rock record called an unconformity. It was named the Great Unconformity by John Wesley Powell, and yes, you need to capitalize it.

These rocks can be seen at Frenchman's Stop in the Frenchman Mountains outside of Las Vegas, and also at the bottom of the Grand Canyon.

#geology #unconformity #TheGreatUnconformity #TapeatsSandstone #ZorasterGranite #VishnuSchist #EarthScientists #rocks #ScienceMastodon