Research any topic before you write.
Find related topics. | Discover entities. | See connections. | Build a topical map.
The Jurassic (/dʒʊˈræsɪk/ juurr-ASS-ik) is a geologic period and stratigraphic system that lasted about 58.3 million years, spanning from the end of the Triassic Period 201.4 Ma (million years ago) to the beginning of the Cretaceous Period, 143.1 Ma. The Jurassic constitutes the second and middle period of the Mesozoic Era as well as the eighth period of…
History, Geography & Regions
Explore the main themes, entities and connections around Jurassic. Start with the topic map, then use the sections below for research and deeper semantic analysis.
Start with a few of the strongest sections from the source topic. These are research directions, not a list of keywords you must use.
High-confidence facts extracted from structured source data. Use them as anchors for further research.
Browse the full topic structure. Each item opens a new analysis centered on that subject.
Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.
See the strongest relationship patterns around the current topic before diving into the raw triples.
Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.
early late middle first triassic known appeared living modern group oldest earliest boundary end appearance cretaceous diversity including extinction ammonite
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Jurassic | Chronological unit | Period | 1.00 | infobox |
| Jurassic | Lower boundary definition | First appearance of the ammonite Psiloceras spelae tirolicum. | 1.00 | infobox |
| Jurassic | Lower boundary GSSP | Kuhjoch section, Karwendel mountains, Northern Calcareous Alps, Austria .mw-parser-output .geo-default,.mw-parser-output .geo-dms,.mw-parser-output .geo-dec{display:inline}.mw-p… | 1.00 | infobox |
| Jurassic | Lower GSSP ratified | 2010 | 1.00 | infobox |
| Jurassic | Name formality | Formal | 1.00 | infobox |
| Jurassic | Regional usage | Global (ICS) | 1.00 | infobox |
| Jurassic | Stratigraphic unit | System | 1.00 | infobox |
| Jurassic | Time scale(s) used | ICS Time Scale | 1.00 | infobox |
| Jurassic | Time span formality | Formal | 1.00 | infobox |
| Jurassic | Upper boundary definition | Not formally defined | 1.00 | infobox |
| Jurassic | Upper boundary definition candidates | Magnetic—base of Chron M18r | 1.00 | infobox |
| Jurassic | Upper boundary definition candidates | Base of Calpionellid zone B | 1.00 | infobox |
| Jurassic | Upper boundary definition candidates | FAD of ammonite Berriasella jacobi | 1.00 | infobox |
| Jurassic | Upper boundary GSSP candidate section(s) | None | 1.00 | infobox |
| Jurassic | is a | extinct family Cheirolepidiaceae | 0.90 | text |
These clusters group vocabulary that occurs around closely connected concepts in the source material.
Bridges can reveal useful research angles that are easy to miss in a flat list of related terms.