Stephen Moshier takes John McArthur to task for his recent critique of the geological principle of uniformitarianism (i.e. geologic processes are the same today as they’ve always been). Moshier points out that McArthur’s definitions and arguments are a little outdated (i.e. he’s criticizing 19th century geology). The post serves as another example that we should be very careful offering authoritative critiques of work done in areas in which we are not specialists (see Giberson on that topic here).