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Sure, that era was the first half of the nineties. I bought my first mtb in 1991 and back than 1 1/8 with rigid forks and canti's was the standard (allthough some builders as Ritchey, Breezer, Serotta,... went on building bikes with 1" headtubes untill late nineties). Suspension forks were aftermarket and only available through LBS. I believe it was from 1994-1995 on that bikes with suspension forks appeared in the catalogs.
edit: ahead stems were from 1993 on but quill didn't disappear immediately.
Figure this is the best place to ask. Was there an era when mountain bikes had 1 1/8 inch headtubes but still used rim brakes? And rigid forks. I think there is but not sure what the era it was?