Miniseries Episode 2:

Australia is one of the top destinations for people who love the ancient Earth. Today, we take a brief tour around the three oldest regions in Australia: the Yilgarn Craton near Perth, the Pilbara Craton near Port Hedland, and the Gawler Craton near Adelaide. On the way, we'll meet the oldest minerals, the oldest fossils, and learn the connection between ancient bacteria and modern steel.

Miniseries Episode 1:

The frozen continent holds many secrets, including some of the most ancient stones in the world, the Napier Complex 3.8 billion years old. Today we'll learn what things lurk in the ice, and a harrowing story of polar survival from an Australian geologist, Sir Douglas Mawson.

Our story will take a brief pause while I'm on summer vacation and fieldwork, including rocks more than three billion years old in Western Australia.

But don't worry! In the meantime, there will be a seven-part miniseries on the oldest rocks of each continent. Tune in to find out which are closest to you, or use these as guides for a geology-themed vacation!

After then, we'll return to the Hadean world to investigate the origins of life. Until then, have a pleasant summer, and thank you all for listening!

Website: https://www.bedrockpodcast.com

My guest today is Dr. Joti Rouillard, a research fellow at the University of Science and Technology in Hefei, China. Dr. Rouillard talks about his research on the earliest fossils on Earth, microscopic bacteria 3.5 billion years old. It turns out, identifying a fossil bacteria is extremely difficult since they resemble other tiny non-living objects. We also talk about working in the Australian Outback, kangaroo encounters, and what happens when you mix alcohol and rocks.

Dr. Rouillard's email: [email protected]

When did life arise on planet Earth?

Today, we look at the search for biological remains in the oldest minerals on Earth, the Jack Hills zircons of Western Australia, 4.4-4.0 billion years ago. We learn why carbon is an excellent building block for life, how to turn that carbon into diamonds and graphite, and why it's very hard to find conclusive fossils in very old rocks.

Extra credit: Try to find all the things in your house that have carbon in them. Bonus points if you can find graphite or diamonds.

How do we know when the first oceans existed?

Water leaves its' fingerprints over every surface of Earth, even in the oldest, toughest crystals. Today, we'll take an imaginary ride through the earliest oceans, examine how water slowly transforms everything it touches, and how these changes are recorded in the Jack Hills zircons, 4.4 billion years ago.

Extra Credit: Make an underwater rock garden, walk into a muddy beach, or visit a dog park.

How did water arrive on planet Earth?

Today, we learn just how much water Earth has, and where it came from in the first place. We'll take a joyride around the early solar system, climb a snow-capped peak, and learn how Jupiter may have played a crucial role in making Earth's oceans.

Extra credit: Drink some water, make a snowball, or watch the Kevin Costner classic Waterworld.

When did Earth's crust form?

It's easy to take the ground beneath our feet for granted, but the story of our crust's origins is one of the most hotly debated topics in Earth history. Today, we'll learn how elements inside tiny crystals help solve this mystery. On the way, we'll meet two researchers who helped keep gold and scientists out of German hands in World War II.

Extra credit: Look at table salt under a microscope, or find different colors of quartz in your local mineral collections.

How is new crust made, and why isn't the Earth constantly expanding like a party balloon? To answer these questions, we'll track the life, death, and rebirth of Earth's surface. Stops along the way include the Mid-Atlantic Ridge, a fight to the death beneath New Zealand, and a stop for some Italian dessert.

Extra credit: Experiment with your carpets at home, pushing them together and testing which one sinks beneath the other.

The idea of plate tectonics is the cornerstone of modern geology.

But it wasn't always that way, and it wasn't an easy idea to sell. Today, we'll meet two scientists who faced ridicule for proposing continental drift: a German climatologist and an American cartographer, the greatest of her generation. We'll also meet a lost expedition to Greenland, the Mid-Atlantic Ridge, and Jacques Cousteau.

Extra credit: Look at maps of the ocean floor, or try to align the continents in various patterns on a map.