Remember when "FluXion" and "Aeolian" were first meant to be released as a double album, yet it ended up that they were released as two separate albums, yet people didn't mind? Well, two years after "Aeolian", we have "Precambrian", a concept double album based around the earliest known times from thousands of millions of years ago, yet described in abstract form to make things less obvious.
The first disc, known as "Hadean/Archean" can easily be called an EP, as it clocks in at 22 minutes. These songs are in an aggressive style for the band, with its share of polyrhythmic structures and everything usually has the pace picked up. It gets you ready for the second disc, which they call "Proterozoic". This is definitely the superior disc, not just because of length, but because everything is executed so flawlessly by a large soundscape of crushing guitars, violins, piano, drums, and other various forms of percussion, including the xylophone and the chimes. Each song is written is a beautiful and structured matter, yet it retains that aggression that "Hadean/Archean" had you pumped up with.
If you want to listen to this album in the best way, play it from beginning to end. This isn't an album meant for shuffle, or an album with any singles on it, it's a breathtaking concept album with a very dynamic performance.