| LOCATION |
| Map |
Show Map
|
| Address |
Zinc Mine Road PUTTAPA |
| Locality |
|
| Accuracy |
H - high level confidence |
| Council Area |
Land Not Within a Council Area (Flinders) |
| Polygon Type |
D - item has been digitised (generally because it doesn't exist in a DCDB parcel, eg. bridge |
| DESCRIPTION |
| Details (Known As) |
Ajax Mine Fossil Reef [Designated as a place of palaeontological and geological significance] |
| Registered Name |
Ajax Mine Fossil Reef |
| Significance |
STATEMENT OF HERITAGE SIGNIFICANCE
The former Ajax copper mine is the location of one of the most significant finds of archaeocyath fossils in the world. Archaeocyaths (ancient cups) were some of the earliest known marine sponges with mineral skeletons which lived in the Lower Cambrian period, around 525 million years ago. These organisms proved highly successful, and over a 10 million year period diversified into a huge array of different forms and over 100 species, playing a dominant role in constructing the Earth's first reefs.
The large ridge of fossiliferous limestone located at the former mine is known throughout the world as the Ajax Limestone. Remarkably in the context of such finds, the Ajax Limestone contains a sample of almost every archaeocyath species known to have existed within the Australian-Antarctic province, and has a diversity which is far in excess of any other assemblage in the province. In addition to this representativeness, the limestone also contains over 100 type species - species that define a genus. This means that the site is one of the key points of reference for those studying the earliest stages of development for Life on Earth.
STATEMENT OF DESIGNATION
The Ajax Mine Fossil Reef is a place of exceptional palaeontological and geological significance. It is the only archaeocyathan terrane of its kind in Australia and displays a number of unique qualities. In particular, it is the type locality for the majority of described Australian-Antarctic archaeocyath species and genera. Its significance is enhanced by the fact that it contains so many type species. A type species is selected to represent and define a genus; with the characters of a genus being determined by reference to its type species. Every genus has one, and only one, type species, and Ajax mine has over 40 type species from the Cambrian period, more than anywhere else in the Australian-Antarctic region. This makes it a place with qualities that are both exceptional and irreplaceable, and one which provides a unique insight into the variety and appearance of fauna of the Lower Cambrian period.
The Fossil Reef is also of outstanding geological significance, having made a considerable contribution to the history of geological science in Australia including supporting the development of methods for the study of fossils. It is also significant for its contributions to the process of global correlation, including matching the geological record of Cambrian age rocks from all continents, and searching for base metals such as copper, lead and zinc in rocks of this age around the globe. The site has been listed by the Geological Heritage Subcommittee of the SA Division of the Geological Society of Australia (GSA) as a Geological Heritage site (file FR 41). |
| Subject Index |
Landscape area - Geological Site; Mining and mineral processing - Mine; Landscape area - Palaeontological Site |
| Class |
State |
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| STATUS |
| Status Code |
REG - Confirmed as a State Heritage Place in the SA Heritage Register |
| Status Date |
28-AUG-2014 |
| REFERENCE |
| LGA |
Unincorporated SA |
| State Heritage ID |
26390 |
| Heritage Number |
26985 |
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| SECTION 16 INFORMATION |
| Section 16 |
c - it may yield information that will contribute to an understanding of the State's history, including its natural history
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| PLAN PARCEL & TITLE |
| As listed in the SA Heritage Register |
| Plan Parcel & Title Information |
CL 6186/442 H833900 B693 |