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We use $Gaia$ eDR3 data and legacy spectroscopic surveys to map the Milky Waydisc substructure towards the Galactic Anticenter at heliocentric distances$d\geq10\,\rm{kpc}$. We report the discovery of multiple previously undetectednew filaments embedded in the outer disc in highly extincted regions. Stars inthese over-densities have distance gradients expected for disc material andmove on disc-like orbits with $v_{\phi}\sim170-230\,\rm{km\,s^{-1}}$, showingsmall spreads in energy. Such a morphology argues against a quiescently growingGalactic thin disc. Some of these structures are interpreted as excited outerdisc material, kicked up by satellite impacts and currently undergoingphase-mixing ("feathers"). Due to the long timescale in the outer disc regions,these structures can stay coherent in configuration space over several Gyrs. Wenevertheless note that some of these structures could also be folds in theperturbed disc seen in projection from the Sun's location. A full 6Dphase-space characterization and age dating of these structure should helpdistinguish between the two possible morphologies.

Kinematics beats dust: unveiling nested substructure in the perturbed outer disc of the Milky Way