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human
[Back to the Future] How did Doc meet Clara?

Based on Doc's gravestone in BTTF3, it's assumed he was close to Clara as the grave reads "his beloved Clara" which evokes confusion in Marty and Doc. Before Marty goes back to warn Doc, Clara is supposed to die falling into what is later known as Clayton Ravine, so named as a teacher named Clara Clayton fell in there. 

Doc and (to a lesser extent) Marty save Clara which results in a big moral conundrum for Doc as he has changed history again. Regardless, the new events have led to the ravine being named Shonash Ravine. If we assume there are 3 timelines based around 1885, A) The original without Doc or any BTTF interference, B) the one with Doc sent back without Marty and ends up dying by Buford's gun but *after* he met Clara, and C) basically the entirety of BTTF3 where Marty saves Doc, surely either Marty wouldn't know of Clayton Ravine due to Doc already having saved her, OR Doc couldn't have known Clara?
gpt
When Doc and Marty are talking, the Mayor of Hill Valley drops Doc's place by to remind Doc that he's supposed to meet the new schoolteacher the following morning, telling them her name. In the timeline without Marty, Doc went on to do just that and met Clara, escorting her into town safely.