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The Ordovician is now dated between The Ordovician, like most periods, has traditionally been sub-divided into Early, Middle and Late epochs, and Lower, Middle and Upper Series, but in practice, this classification is of little use except for the application of broad general patterns.

However, it does show the specific relative age position of the Trenton Group carbonates relative to other key stratigraphic intervals in the Upper Ordovician of New York.

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Although the duration of the Late Ordovician is now established at approximately No absolute dates have been published establishing the depositional time of the Trenton, but current estimates by Holland and Patzkowsky suggest that the total time for this interval is approximately 4 to 5 million years.

This is due, in part, to the lack of the key diagnostic graptolite and conondont species used in the British system. This site will follow the North American Classification system, as Trenton Falls is one of the primary type sections for this dating system.

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The North American series and stage classification has been constructed in part based on the rock exposures in central New York State. In the Geologic Time Scale, time is generally divided on the basis of the earth's biotic composition, with the Phanerozoic Eon i. The most recent publication dealing with the chronostratigraphic framework of the Trenton Group and its lateral equivalents for the New York State region was published in by Brett and Baird.

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The Ordovician Period is stratigraphically younger than the Cambrian Period and stratigraphically older than the Silurian, which overlies it. Historically, the identification of European global series and stage boundaries has been difficult in North American carbonate-dominated rocks, such as the Trenton limestone.

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However, for the purpose of introducing them, the most critical observations shown in the diagram are: 1 the presence of several there are 3 major ones shown disconformities in the rocks in this area as shown by the vertical striping. These two separate classification systems are presently in use for the establishment of chronostratigraphic age, one called the North American Stage Classification and the other the British or European Stage Classification system.

The large-scale westward shift in facies belts through time beginning near the end of the Diplograputus multidens Middle Mohawkian chronozone and progressing through the Geniculograptus pygmaeus graptolite chronozone; and 3 the relative dominance of carbonate facies in blue in the Western Mohawk Valley in the Mohawkian and the dominance of shale and flysch facies in black and stippled gray in the Eastern Mohawk Valley.

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This diagram shows several key features which will be discussed in detail in other sections of this website. In order to make a more useful and practical time-scale the Ordovician has been sub-divided into distinctive, well-defined intervals of time often referred to as series and stages. These include: a the basal Trenton Unconformity which is accentuated and of longer duration in the central Mohawk Valley in the neighborhood of the Canajoharie Arch; b the upper Trenton Lower Utica disconformity centered in the Western Mohawk Valley region in the vicinity of Middleville, New York; and c the top Schenectady disconformity centered in the region to the east of Little Falls New York; 2.

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Image integrated from Webby et al. Both relative dating systems are shown in the figure above so that the reader can be familiarized with the classification systems now employed globally for this period of time. Figure modifed from Webby, Upper Ordovician Chronostratigraphic Time Scale.

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Key index taxa graptolites and conondonts species that are commonly used for correlation are also provided in stratigraphic succession. In their diagram, Brett and Baird have summarized the current biostratigraphic and lithostratigraphic units on a spatial scale from central to eastern New York Statewhich approximates the depositional strike of the Trenton Group during the Upper Ordovician.

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In addition to the relative dating of periods in Earth's history for which we have rocks preserved, geologists are now able to as absolute age dates to critical intervals. In their figure, as shown below, there are no specific absolute age restraints placed on the strata from the type section of the Trenton limestone.

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Within the context of the Phanerozoic Eon, geologists beginning in the late 's recognized that fossils appeared in an orderly fashion in stratigraphic units. Adding to the complexity of stratigraphic nomenclature of the geologic time scale, two main systems are employed to deate these time units.

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The British classification system is more often used and represents the preferred chronostratigraphic system for the Ordovician. The relationship between the British and North American stage nomenclature is provided in the figure above.

Moreover, these geologists recognized that the fossilized biota demonstrated rather large changes in overall composition and showed both similarities with, and differences from living taxonomic groups. Main Menu Utility Menu Search.

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The modern Geologic Time Scale as shown above is a compendium of both relative and absolute age dating and represents the most up-to-date assessment of Earth's history. Much of the relative geologic time scale had been constructed prior to the 20th century, but much progress has been made in the last half-century toward defining the absolute ages of the rocks on which the relative time scale is based. These stratigraphic intervals are highlighted yellow. In order to fully understand the complexities of the diagram shown above, the reader Trenton encouraged to visit discussions on the times setting of the Trenton Group, as well as sections on the lithostratigraphy and biostratigraphy as found in the section on sedimentary geology.

These eras were referred to as the Paleozoic meaning ancient lifethe Mesozoic meaning middle lifeand the Cenozoic meaning recent life based on their relative similarity dating modern taxa.

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These dates are used to study, among other things, the tempo or rates of environmental and biologic change occurring on Earth. The majority of fossil organisms, however, did not match with modern groups; this led to the classification of three major eras within the period of time when the Earth's surface was populated with advanced life forms. The Mohawkian Series, of which the Trenton limestone is a part, is now in use as the lower part of the Upper Ordovician.

The Geologic Time Scale, as shown above, documents intervals of geologic time relative to one another, and has been continuously developed and updated over the last two centuries.

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Paleontologists have developed an equally well-defined chronostratigraphic framework for use in the cratonic rocks of North America. Using a variety of techniques and dating methods, geologists have been able to ascertain the age of the Earth, as well as major eras, periods, and epochs within Earth's history.