Science Direct, or really, Earth and Planetary Science Letters, has a study of very old craters that suggests that in the Ordovician period, around 460 million years ago or so, when trilobites and nautiloids ruled the world (because dinosaurs hadn’t been invented yet), Earth may have had its own Saturn-like ring:
Highlights
• Earth may have had a ring during the middle Ordovician, from ca. 466 Ma.• Breakup of an asteroid passing within Earth’s Roche limit likely formed the ring.
• Among several features preserved is a near-equatorial band of impact craters.
• Shading of Earth by the ring may have triggered a global icehouse period.
…
To investigate the possibility of a ring-forming event in the mid-Ordovician, we examined the paleolatitude positions (based on six tectonic plate reconstruction models; Domeier, 2016, 2018; Merdith et al., 2021; Scotese, 2016; Torsvik and Cocks, 2016; Torsvik et al., 2014) of the 21 meteorite impacts known to coincided with the enhanced Ordovician meteorite flux.
[via Dr. Sarah “Squid Facts” McAnulty on Bluesky]