A misspelling or non-standard variant of fossilology; not standard in modern English.
This appears to be a typographical error of 'fossilology,' incorrectly dropping one 's' from the double-s in 'fossil'.
This variant shows how compound words built on 'fossil' can go wrong if we're not careful with double letters—'fossil' + 'logy' becomes 'fossilology,' not 'fosslology,' reminding us that dictionary spelling matters!
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