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Advantages of the new tools in frontier stratigraphy are: Standardisation during computer input of the fossil record and execution of (semi-) objective stratigraphic methods gives access to all data and interpretations. Data sets and results are easy to communicate and rapidly updated with new information. Integration of all fossil and also physical (e.g. isotope, well-log) events in one stratigraphic solution increases resolution and practical use.
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Advantages of the new tools in frontier stratigraphy are:
BASIC CONCEPT
BASIC CONCEPT
local versus regional ranges Diagram 2A: Theoretical example showing distributions in space and time of seven different taxa with true chronological succession
BASIC CONCEPT
BASIC CONCEPT
RASC zonations are based on average stratigraphic events. The average interval zone between the exists of taxa A and B begins before the highest occurrence of B in section 3, and ends before the highest occurrence of A in section 2.
BASIC CONCEPT
Relationship between observed range extending from t1 to t2 and true range from T1 to T2. Strauss and Sadler (1989) assumed that the probability of finding a fossil is constant across its true range. If species is less abundant at its time of appearance, it becomes more difficult to estimate the true range even if facies and sedimentation rate remained constant. Using unbiased point estimator and the upper range extention to 95% confidence interval
BASIC CONCEPT
of the highest and lowest occurrence of taxa
100m 50m Actual find Observed local range Upper range extention to unbiased point estimator Upper range extention to 95% confidence interval
3874 Lowest occurrence based on calculation
BASIC CONCEPT
of the highest and lowest occurrence of taxa
diversity time