Part of the mission of the BLM is the management and preservation of the cultural and heritage resources found on America's public lands - prehistoric and historic.
The author created this website as a BLM employee and continues to update and enhance the site in retirement as a volunteer.
The following charts and pictures on the dating bottles pages listed below should help.
This page provides some examples of how to use the website (primarily the Bottle Dating pages) to determine the approximate date or date range for various types of bottles made between the early 1800s and the mid-20th century.
In addition to technology, products and manufacturers, certain types of glass colours will also aid in dating. This type of bottle was probably dip-moulded and dates after circa 1820.
Is the base indented with an irregular to round pontil scar?
If a user needs to refresh themselves on the terminology used to describe the various parts of the bottle, click on Bottle Morphology to view a pop-up page of physical bottle feature definitions.
Once the likely bottle age or date range is determined, some examples of other places to look for more information is provided.: -It is about 9" (23 cm) in height and 2 3/8th inches (6 cm) in diameter.
Loaded with detailed descriptions and diagrams, and luscious high res photos, this is a superlative one-stop educational resource and vicarious digger experience.
-It is made of thick, heavy glass for its size, weighing almost 1 lb.
-There are molded (embossed) "swirls" on the shoulder and upper body of the bottle.
The bottles used for illustration are a small but diverse assortment designed to give users guidance on how to work a bottle through the dating information to answer the Homepage's primary question #1 - What is the age of the bottle?
) to the specific dating questions on the Bottle Dating page are included so that a user can reference the necessary portions of that page.