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We present a chronology of the formation and early evolution of the Oortcloud by simulations. These simulations start with the Solar System being bornwith planets and asteroids in a stellar cluster orbiting the Galactic center.Upon ejection from its birth environment, we continue to follow the evolutionof the Solar System while it navigates the Galaxy as an isolated planetarysystem. We conclude that the range in semi-major axis between 100au and several10$^3$\,au still bears the signatures of the Sun being born in a1000MSun/pc$^3$ star cluster, and that most of the outer Oort cloud formedafter the Solar System was ejected. The ejection of the Solar System, we argue,happened between 20Myr and 50Myr after its birth. Trailing and leading trailsof asteroids and comets along the Sun's orbit in the Galactic potential are theby-product of the formation of the Oort cloud. These arms are composed ofmaterial that became unbound from the Solar System when the Oort cloud formed.Today, the bulk of the material in the Oort cloud ($\sim 70$\%) originates fromthe region in the circumstellar disk that was located between $\sim 15$\,au and$\sim 35$\,au, near the current location of the ice giants and the Centaurfamily of asteroids. According to our simulations, this population iseradicated if the ice-giant planets are born in orbital resonance. Planetmigration or chaotic orbital reorganization occurring while the Solar System isstill a cluster member is, according to our model, inconsistent with thepresence of the Oort cloud. About half the inner Oort cloud, between 100 and$10^4$\,au, and a quarter of the material in the outer Oort cloud, $\apgt10^4$\,au, could be non-native to the Solar System but was captured fromfree-floating debris in the cluster or from the circumstellar disk of otherstars in the birth cluster.

Oort cloud Ecology II: The chronology of the formation of the Oort cloud