"They didn't look like any concretions I'd ever seen" -Donald M. Burt

Alright, so this LPI is literally elementary for understanding Real-Mars. Almost everything in it is fundamental yet no one outside the planetary science field will know any of it unless they really try, and actually watch this LPI. Almost every spoken word in this LPI is golden. 

• The facts come hard and fast in this LPI. Slide at 0:30.
• Slide at 2:57. Dust can explain most Mars deposition. It wasn't water, it was dust that put the most common layers down.
• Pay attention to what he says at the slide at 5:40
• Super important. The slide at 7:11. Listen to what is said, and then note the importance of the new rover Perseverance which had not yet landed when this LPI first was uploaded. The Kodiak mesa has cross-bedding inside it. It's a huge deal, and planetary scientists are keeping it on the DL for now.
• At 10:00. The theory about blueberries is now changed forever.
• At 10:30. The Cross-bedding dilemma is explained perfectly.
• Slide at 13:40. The plains around alluvial fans have more material in them than the canyon cut volume can fill. But the canyons funnel impact flows, making up the lions share of the deposition.
• Slide at 15:30, simply drills home the Blueberry dilemma.
• Watch the questions too after 18:30.

You rarely get knowledge-bombs dropped with this kind of frequency. LPI's and scientific papers are usually focused on one detail. This LPI represents one of those moments in history where a common belief is blown away by pure logos. 

I'll tell you the endgame of this. What all the Mars science is heading to is that Mars has always been an ice-ball losing it's ice. Glacial action dominated the north through the Hesperian, but only episodic action, eruptions and impacts, cut the river beds and gullies. It possibly never rained outside impacts. Mars lost it's magnetosphere and the lions share of it's atmosphere at the same time in the Prenoachian,when the crust was still mostly soft. There never was a "blue-Mars."