The impact that formed Herschel Crater on Mimas, Saturn's moon, occurred approximately 4.1 billion years ago, as estimated by cratering models and the moon's surface age. Given this ancient timeline, any material ejected from this impact would have had to travel through space for billions of years to reach Earth. While interplanetary material transfer is theoretically possible, the likelihood of such material impacting Earth at a specific time relevant to human history or prehistory is extremely low due to the vast distances and time scales involved. No direct evidence has been found linking material from Mimas to Earth impacts during historical or prehistoric times.
Regarding evidence of extraterrestrial impacts around significant historical or prehistoric events, the Younger Dryas impact hypothesis suggests that a large-scale cosmic impact event occurred approximately 12,900 years ago, potentially contributing to the onset of the Younger Dryas cooling period. This hypothesis is supported by findings of high-temperature melt-glass, nanodiamonds, and other impact-related markers in sediment layers from that time. However, this hypothesis remains controversial and is not universally accepted within the scientific community.
As for antediluvian flood myths, many cultures have flood narratives that may be inspired by local flooding events or larger regional climatic changes. The connection of these myths to a specific extraterrestrial impact event is speculative and lacks direct empirical evidence. However, some researchers have proposed that impacts could have triggered significant environmental changes leading to floods, although this remains a topic of debate.
In summary, while the theoretical possibility exists for material from Mimas to impact Earth, there is no concrete evidence supporting such an event occurring at a time relevant to human history or prehistory. The Younger Dryas impact hypothesis provides some evidence of cosmic impacts around the time of significant climatic changes, but its link to flood myths remains unproven.