A. Size of impact crater The diameter is one of the main characteristics of an impact crater
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More than 40 km (in case of complex craters) or more than 4 km (in case of simple craters) |
5 |
20 - 40 km (in case of complex craters) or 3 - 4 km (in case of simple craters) |
4 |
12 - 20 km (in case of complex craters) or 2 - 3 km (in case of simple craters) |
3 |
4 - 12 km (in case of complex craters) or 1 - 2 km (in case of simple craters) |
2 |
Less than 4 km (in case of complex craters) or less than 1 km (in case of simple craters) |
1 |
B. Diversity of megascopic and macroscopic elements The simultaneous occurrence of different geological and geomorphological features increases the overall scientific value because it allows a better understanding of the crater's genetic processes
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Occurrence of more than five types of elements (circular crater and uplifted rim, visible central uplift, shatter cones, polymictic and monomictic breccias, folds, and faults) |
5 |
Occurrence of five types of elements |
4 |
Occurrence of four types of elements |
3 |
Occurrence of three types of elements |
2 |
Occurrence of two types of elements |
1 |
C. Diversity of microscopic elements The occurrence of different geological elements such as coesite, planar deformation features, pseudotachylites, kink bands, feather features, and impact melts increases the overall scientific value because it allows a better understanding of the crater's genetic processes
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Occurrence of coesite and planar deformations features |
5 |
Occurrence of coesite or planar deformations features |
4 |
Occurrence of these four elements: pseudotachylite, kink bands, feather features, and impact melts |
3 |
Occurrence of three elements out of four: pseudotachylite, kink bands, feather features, and impact melts |
2 |
Occurrence of two elements out of four: pseudotachylite, kink bands, feather features, and impact melts |
1 |
D. Integrity Conservation status of main geological and geomorphological elements
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D.1. Crater rim |
Very well preserved and with a circular shape |
5 |
Well preserved but without a complete circular shape |
3 |
Still visible but only in small portions |
1 |
D.2. Central uplift (in case of complex craters) |
Very well preserved |
5 |
Well preserved but not complete |
3 |
Still visible but just in small portions |
1 |
D.3. Impact breccias |
The breccias are very well preserved |
5 |
The breccias are still visible |
3 |
The breccias are highly weathered or damaged |
1 |
D.4. Shatter cones |
The shatter cones are very well preserved |
5 |
The shatter cones are still visible |
3 |
The shatter cones are highly weathered or damaged |
1 |
E. Scientific knowledge In general, the scientific value of a geosite is proportional to the number and quality of publications produced about the site
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There are more than two papers about the geological/geomorphological elements associated with the impact structure published in international journals |
5 |
There is at least one PhD thesis about the geological/geomorphological elements associated with the impact structure |
4 |
There is at least one paper about the geological/geomorphological elements associated with the impact structure published in international journals or more than three papers published in national journals |
3 |
There is at least one master dissertation about the geological/geomorphological elements associated with the impact structure |
2 |
There are at least three abstracts about the geological/geomorphological elements associated with the impact structure presented in scientific events |
1 |