Title：Data from the Guide Basin in the NE Tibet over the past 13.7-10 Ma
We measured several proxies to reconstruct hydroclimate variability in the Ashigong Formation in the Guide Basin, including manganese-to-iron ratios (Mn/Fe, ~10 cm sampling resolution) and clay mineral content (~1 m sampling resolution)
Methods：
A total of 3700 samples (~10 cm sampling resolution) were collected after removal of the weathered outcrop surface (this removed surface corresponds to a minimum of the uppermost 0.5 m). Ages of the samples are based on the age model of Wang et al. (2018). Approximately 5 g of each sample were ground into powder and passed through a 200-mesh sieve. To determine the abundance of Fe and Mn, samples were measured by a portable energy-dispersive Innov-X Systems X-ray fluorescence spectrometer in geochemistry mode using beam 1 (50 kv) and beam (10 kv) at the Chinese University of Geoscience (Wuhan). The measurement time for each sample was at least 50 s, taking the average value of three measurements. About 0.5 g of each powdered sample was further sieved using a 150-mesh screen, and mineral contents were subsequently determined using a Olympus Terra BTX II X-Ray Diffraction Analyzer at the Chinese University of Geoscience (Wuhan). The measurement time for each sample was at least 25 min. 
Data specific information：
We provide Mn/Fe and Smectite/(illitet+chlorite) data, and age is based on astronomical tuning results.