19bb863a_loney_Detection___RationalWiki__Definition
[Type of fallacy] Short-term vs. long-term [Example] Currently the earth's magnetic field is decreasing in intensity. At this rate, according to the time-frame supposed by evolution, the field would have originally been so powerful as to render earth inhospitable. Evidence, of course, suggests that the earth's magnetic field not only waxes and wanes, but even switches polarity every so often. [Definition] 
Assuming a current trend has remained constant throughout its history and will continue to do so in the future, even though no evidence suggests such an extrapolation is justified.
The Fine Art of Baloney Detection - RationalWiki
Definition