Dating old buildings

Chronological dating, or simply dating, is the process of attributing to an object or event a date in the past, allowing such object or event to be located in a previously established chronology.

This usually requires what is commonly known as a "dating method".

Several dating methods exist, depending on different criteria and techniques, and some very well known examples of disciplines using such techniques are, for example, history, archaeology, geology, paleontology, astronomy and even forensic science, since in the latter it is sometimes necessary to investigate the moment in the past in which the death of a cadaver occurred.

Relative dating methods are unable to determine the absolute age of an object or event, but can determine the impossibility of a particular event happening before or after another event of which the absolute date is well known.

In this relative dating method, Latin terms ante quem and post quem are usually used to indicate both the oldest and the most recent possible moments when an event occurred or an artifact was left in a stratum.

But this method is also useful in many other disciplines.

Historians, for example, know that Shakespeare's play Henry V was not written before 1587 because Shakespeare's primary source for writing his play was the second edition of Raphael Holinshed's Chronicles, not published until 1587.

Thus, 1587 is the post quem dating of Shakespeare's play Henry V.

The same inductive mechanism is applied in archaeology, geology and paleontology, by many ways.

For example, in a stratum presenting difficulties or ambiguities to absolute dating, paleopalynology can be used as a relative referent by means of the study of the pollens found in the stratum.

This is admitted because of the simple reason that some botanical species, whether extinct or not, are well known as belonging to a determined position in the scale of time.

For a non-exhaustive list of relative dating methods and relative dating applications used in geology, paleontology or archaeology, see the following: Same as geologists or paleontologists, archaeologists are also brought to determine the age of ancient materials, but in their case, the areas of their studies are restricted to the history of both ancient and recent humans.

Thus, to be considered as archaeological, the remains, objects or artifacts to be dated must be related to human activity.

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  1. NAIL CHRONOLOGY as an aid to dating old buildings. The National Park Service in it's his- toric structures restoration program has developed some research techniques in the general field of nail chronology as an aid to dating old buiUlings. This paper was prepared for a National Park. Service Historic Structures Training.

  2. Exploring some of the principal methods by which architectural historians can date historic buildings, from the use of archive documents, old maps and photographs to dendrochronology and other forms of materials analysis, by Frank Kelsall.

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