I agree with you that, the 'Time Speeding up' and Schumann Resonance info can only be found on these New Agey web sites, as far as I have looked SO FAR.
However, I came across this information in books on ancient maps, and ancient civilisations.
Charles Hapgoods maps, show that the Earth was mapped out pretty accurately possibly thousands of years before even the Americas were discovered. Longitude measurements must have existed may be even thousands of years before longitude measuring tool, the chronometer was invented. Otherwise, the ancients would not have had these accurate maps that even equate with the modern day Mercator Maps.
Also, fossilised remains of trees, and even coal has been found in Antartica which supports 'Earths Crust Displacement Theory',
I know that is just a vague description of what I have been reading up, but I remember quite a few years ago, several scientist insisting that global warming is NOT being caused by us, cars, pollution etc but that it is part of a natural Earth cycle and that the skin of the Earth, all 33 miles thick of it, does move, though immeasurably in any lifetime.
This causes land masses not to be where they 'should' be and gradually ice that should remain ice, will melt as it is no longer at the coldest parts of the earth. Also, climate will change due to different influence on the Earths climate.
It's hard to put all this into one sentence as this is masses upon masses of books and a few websites I have read in the last year.
I started my interest with 'Fingerprint of the Gods' by Graham Hancock, a year or so ago, and took up on serpent cults, prehistory and a little bit of physic, (though physics is all greek to me!) and certain things seem to equate a pattern.
The 26,000 year Earth Cycle, (continuing cycle) has basis in science but again, so much to find out, so little time.