earth science

Grimmen Formation

Grimmen Formation is a earth science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Grimmen Formation rather than just read about it. In short: The Grimmen Formation is a Lower Jurassic (Toarcian) geological formation in northeastern Germany, primarily exposed in the Grimmen and Klein Lehmhagen clay pits and documented in wells such as Reinberg 1E. Formally established in 2025, it was previously part of the informal "Green Series" of the Ciechocinek Formation.

Key takeaways

Grimmen Formation belongs to earth science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Grimmen Formation to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Grimmen Formation from memory before moving on to harder problems.

Reference excerpt

The Grimmen Formation is a Lower Jurassic (Toarcian) geological formation in northeastern Germany, primarily exposed in the Grimmen and Klein Lehmhagen clay pits and documented in wells such as Reinberg 1E. Formally established in 2025, it was previously part of the informal "Green Series" of the Ciechocinek Formation. It represents a prodelta to brackish-marine depositional system in the eastern North German Basin (NGB), shaped by sea-level changes and the Toarcian anoxic event.

History Studies of Toarcian strata near Grimmen began in 1874 with the discovery of fossiliferous clays in a railway cutting near Schönenwalde, 5 km north of Grimmen, initially misidentified as Middle Jurassic due to ammonite finds. In 1909, the succession was reclassified as Lower Toarcian (Lias epsilon), distinct from the Posidonia Shale Formation. From 1959 to 1995, the Grimmen clay pit was excavated, revealing a glacially dislocated raft of Liassic clays and sands deformed by Pleistocene ice advances. Exploration wells (e.g., Reinberg 1E, Kb Barth 10, Kb Grambow 5) since the 1950s provided extensive core data, with Reinberg 1E designated as the reference section in 2025. The clay pit, abandoned and water-filled since 1995, was established as the type section in 2025, with 2016 and 2020 excavations refining an 18 m composite log spanning the Pliensbachian-Toarcian boundary to the elegans Subzone.

Sedimentology/Lithology

The Grimmen Formation comprises greenish to bluish claystones, siltstones, and fine-grained sandstones, with siderite and carbonate concretions, reaching up to 100 m thick in the eastern North German Basin. The type section in the Grimmen clay pit forms an 18 m composite log, transitioning from Pliensbachian sandy deposits of the Wolgast Formation to Toarcian organo-detrital clays and heteroliths of the Lehmhagen Member (Posidonia Shale Formation), followed by the Reinberg Member of the Grimmen Formation. The Reinberg Member (~10 m thick) starts with bluish clays, grading to greenish, pellet-laminated clays with exaratum and lower elegans marker beds (marly limestones with fecal pellets). Pellet laminae, up to 5 mm thick, decrease upsection, while silty/sandy intercalations and siderite concretions increase, forming a coarsening-upward trend with pyrite-filled burrows. The upper Grimmen Formation features greenish clays with thin silt/sand laminae in 8–15 m symmetric cycles, capped by the Glashütte Formation's deltaic sandstones. Heavy minerals (zircon, rutile, tourmaline) and smectite-group clay minerals indicate volcanogenic input, while kaolinite and chlorite are common. Glacially dislocated Eocene greensand and clay are locally intercalated. Organic-rich layers contain charcoal fragments, suggesting wildfires. Toarcian material found in glacial Erratics in Ahrensburg and the Hagen Forest have been in controversy due to its dubious origin, being linked with the Rya Formation and Sorthat Formation, as well this unit. They were originally considered or local or Baltic in derivation, but that changued with the recovery of erratic concretions in the Baltic sea cliffs near Lübeck, being found as part of the Weichselian Glacial Maximum. Liassic–Cretaceous sediments in the assemblage are most probably associated with the tectonic Sorgenfrei-Tornquist Zone. The origin of this erratics from southwestern Baltic, Poland or Danish archipelago is unlikely, as those zones are dominated by Late Cretaceous–Paleocene strata, suggesting that this Toarcian assamblages should come from south/SW between STZ–TTZ and the German Baltic coast. The most clear hint link this deposits with the Grimmen Fm, as they're identical in fauna and facies composition of Grimmen and Dobbertin, also affected by subglacial erosion and thrusting, suggesting a close stratigraphic and palaeogeographical origin.

Paleoenvironment

… excerpt ends here. Continue reading the full article.

Illustrations

Profile at Grimmen

Worked examples

Example 1 — a first encounter with Grimmen Formation

Start with the simplest possible case. Write down what Grimmen Formation claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In earth science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Grimmen Formation before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Grimmen Formation ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Grimmen Formation

In research: Grimmen Formation appears in earth science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Grimmen Formation in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Grimmen Formation is common in secondary-school and first-year university syllabi. It links to neighbouring topics Deltaic deposits, Fossiliferous stratigraphic units of Europe, Geologic formations of Germany, so understanding it makes those chapters shorter.
In everyday life: Look for Grimmen Formation outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Grimmen Formation in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Grimmen Formation means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Grimmen Formation out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Grimmen Formation in simple terms?

Why does Grimmen Formation matter?

Because it connects several earth science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Grimmen Formation?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Grimmen Formation.