SĂĄdan identificeres Shell Fossils

Shell fossiler kommer i en bred vifte af former og størrelser.

Det første skridt i at identificere shell fossiler er at sikre, at det emne, du undersøger, er en sand fossil, ikke en moderne shell. Shell fossiler dannes, når et dyr dør og synker til bunden af ​​en sø eller et hav. Hvis dyret bliver dækket af snavs og ikke spises, bliver det beskyttet mod erosion og andre miljøfarer. Når sedimentet ophobes, komprimerer vægten det underliggende område. I en proces, der kaldes lithification, ændrer trykket fra denne vægt snavset i sedimentær rock, og de hårde dele af dyret er mineraliseret.

Se forsigtigt på skallen, og overvej vægten. Ægte fossiler er sten og vil være meget hårdere og tungere end skaller.

Analysér den overordnede form. Fossile skaller kan være cirkulære, ægformede, kopformede, rørformede eller spiralformede. Spiralskaller er ofte snailfossiler eller ammoniter.

Se på skalens orientering. Nogle brachiopodskaller er bikonvekse, hvilket betyder, at begge sider af skalkurven udadtil. Undersøg hængslet på skallen, hvis den har en. Nogle hængsler er flade; andre er spidse.

Undersøg overfladen af ​​skallen. Mønstre på skallen hedder dekoration, og de kan være nyttige til identifikation af arter.

Brug et simpelt ja-nej system til at hjælpe med at identificere shell fossiler ved hjælp af en fossil felt guide. Gennem elimineringsprocessen kan du indsnævre listen over arter, som en bestemt fossil repræsenterer.

Tip

Arbejde fra almindeligt udseende til detaljer. Museets hjemmesider har ofte gode fotografier af fossiler.

Advarsel

Dendrit er krystalformationer, der ligner fossiler, men er ikke fossiler. Indsamle ikke fossiler pĂĄ privat ejendom, medmindre du har tilladelse fra ejeren.

SĂĄdan identificeres Shell Fossils

FAQ - 💬

❓ How do you tell if a shell is a fossil?

👉 Here are some cutaway views of other shells. The interior of a fossilized shell would be solid with rock and the exterior would likely have rock matrix stuck to it. The fossil would be as heavy as the stone it has been turned into by the process of fossilization.

❓ How do you identify shells?

👉 Many details can help us correctly identify our shell, including:

  1. subtleties in the size, direction, number and type of ridges, knobs, folds, striations, crosshatching, etc.
  2. spike height or compression.
  3. color markings around the hip or crown.
  4. length of syphon channel.
  5. shape of opening and inner markings or ridges.

❓ What is a fossil that looks like a shell?

👉 AmmonitesAmmonites were shelled cephalopods that died out about 66 million years ago. Fossils of them are found all around the world, sometimes in very large concentrations.

❓ How do I identify a fossil?

👉 something becomes a fossil, it mineralized, or becomes made of minerals. This usually means an increase in weight. A fossil bone is heavier than a normal bone, noticeably so. So, if your object is heavy, it might be a fossil.

❓ What can shell fossils tell us?

👉 They tell us what organisms lived in a certain place. They can tell what the organism looked like. They can tell what the environment was like in the place where the organism lived. Fossils can also tell how organisms have changed over time.

❓ What are the different types of shell fossils?

👉 The most common sea shells found on modern beaches are mollusks (phyllum Mollusca). The most commonly observed mollusks types (classes) are clams (Pelecypoda), snails (Gastropoda), and squids and octopi (Cephalopoda). These classes also represent the most common mollusk fossils in Kentucky.

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