This statement is possibly surprising in view of the fact that almost any modern writer can produce a geologic timetable [based on evolutionary theory applied to "index fossils") that gives precise datings and lengths of the eras and systems and even of some of the smaller subdivisions . These figures have been obtained in various remarkable ways. ]"Ultimately, however, they are tied to three [radioactive] dates based on atomic disintegration: (1) 60 million years, the age of the pitchblende at Central City, Colorado; (2) 220 million years, the age of the pitchblende at St.Joachimstal, Bohemia; and (3) 440 million years, the age of the uranium-bearing shale at Gullhogen, Sweden.
Please remember that all dating methods, even those termed "absolute," are subject to margins of error. That is a very small amount of possible error range. Modern studies almost always use two or more methods to confirm dating work and to build confidence in the results obtained.
The oldest known vascular plants in the Northern Hemisphere are from the Devonian Period.
The vegetation of the early Devonian consisted primarily of small plants, the tallest being only a meter tall.
(2) The 19th century dating theory was applied to the fossils and strata, so the evolutionists are required to bring all other long-ages dates into alignment with those theoretical dates. In fact, radiodating is so conflicting in its results, that, out of hundreds of thousands of tests, ONLY THREE test results have agreed sufficiently with evolutionary theory to be used as "norms." Each of these, of course, could only apply to a single stratum:"An urgent task for geology is to determine, in years, the length of the eras, periods, and 'ages' and, eventually of the zones.
Not a single one of themeras, periods, and ages, let alone zones--has yet been reliably determined.