The late Aalenian until the end of the Bathonian was characterized by basaltic volcanism. |
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The Bajocian Stage overlies the Aalenian Stage and underlies the Bathonian Stage. |
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The Toarcian Stage overlies the Lower Jurassic Pliensbachian Stage and underlies the Aalenian Stage of the Middle Jurassic Series. |
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The Aalenian Stage underlies the Bajocian Stage and overlies the Toarcian Stage of the Lower Jurassic Series. |
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For example, unlike the Aalenian and Bajocian stages, two different ammonite sequences are used for the sub-Mediterranean region and northwestern Europe. |
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