1. This is the best tl;dr I could make, [original](https://www.abc.net.au/news/science/2019-08-16/super-deep-diamonds-give-us-window-into-the-deep-earth/11412730) reduced by 92%. (I’m a bot)
    > Dr Timmerman's team didn't just look at any diamonds, they looked at super-deep diamonds sourced from Brazil.

    > They discovered the diamonds had high helium 3 to helium 4 ratios, confirming the primordial reservoir exists either at the depth at which the diamonds were formed or below them in the lower mantle.

    > Professor Foley said the study clears up an age-old controversy, and shows how crucial diamonds are as the only samples we have to give us information about the deep Earth.

    [**Extended Summary**](http://np.reddit.com/r/autotldr/comments/cqxjvf/diamonds_point_to_existence_of_ancient_rocks_from/) | [FAQ](http://np.reddit.com/r/autotldr/comments/31b9fm/faq_autotldr_bot/ “Version 2.02, ~420354 tl;drs so far.”) | [Feedback](http://np.reddit.com/message/compose?to=%23autotldr “PM’s and comments are monitored, constructive feedback is welcome.”) | *Top* *keywords*: **diamond**^#1 **mantle**^#2 **Earth**^#3 **form**^#4 **helium**^#5

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