Up-going and Horizontal Tau Air-Showers , UpTaus and HorTaus , may trace Ultra High Energy Neutrino Tau Earth Skimming at the edge of the horizons .
Their secondaries ( \mu ^ { \pm } and \gamma bundles with e ^ { \pm } pair flashes ) might trace their nature over UHECR secondaries in horizontal showers .
Indeed the atmosphere act as a perfect amplifier as well as a filter for showers : down-ward and horizontal \mu bundles may still be originated by far Ultra High Energy Cosmic Rays skimming the terrestrial atmosphere but their rich gamma component will be exponentially suppressed .
At large zenith angles after crossing a large slant depth ( X _ { max } > 3 \times 10 ^ { 3 } g cm ^ { -2 } ) the number of \mu ^ { \pm } and secondary \gamma ’ s ( produced by the e ^ { \pm } pair from \mu decay in flight ) is comparable .
On the other hand , up-ward muon bundles from UpTaus and HorTaus may arise within a young shower with a larger gamma-muon ratio ( \sim 10 ^ { 2 } ) , leaving its characteristic imprint .
We estimate the UpTaus and HorTaus rate from the Earth and we evaluate the consequent event rate of \mu ^ { \pm } , e ^ { \pm } and \gamma bundles .
We show that such events even for minimal GZK neutrino fluxes could be detected by scintillator arrays placed on mountains at 1 - 5 km and pointing to the horizon .
The required array areas are within tens-hundreds of square meters .
An optimal structure is an array of crown-like twin detectors facing the horizons .

We argue that such detectors will be able to detect both muonic bundles at a minimal average flux of 10 ^ { -11 } cm ^ { -2 } s ^ { -1 } sr ^ { -1 } and electromagnetic particles ( \gamma , e ^ { \pm } ) at 3 \times 10 ^ { -9 } cm ^ { -2 } s ^ { -1 } sr ^ { -1 } , a few times each year , even for the minimal GZK \nu flux .