Early Jurassic extrinsic solar system dynamics versus intrinsic Earth processes: Toarcian sedimentation and benthic life in deep-sea contourite drift facies, Cardigan Bay Basin, UK

Progress in Earth and Planetary Science

Table 2 Spectral peak values recognized in the present study against the background of calculated present-day component orbital periodicities

Phycosiphon morphotype Ph2 [kyr]	Phycosiphon morphotype Ph3 [kyr]	Thalassinoides [kyr]	Schaubcylindrichnus [kyr]	Planolites [kyr]	Trichichnus [kyr]	Lamination [kyr]	Undulated bedding [kyr]	Calculated orbital periods [kyr]
					155–174	132–148		173	Obliquity AM
104–117	108–121		115–129	111–125		132–148		112	Eccentricity bands
		81–91					75–84	95	Eccentricity bands
			66–74.2				75–84	59–64	Combined effect
	36.2–40.7		39.9–44.9		42.6–47.9			40–42	Obliquity bands
	36.2–40.7						35.3–39.7	37.5	Main obliquity term (Toarcian)
29.8–33.4	25.9–29	24–27	35.6–40	25.7–28.9		29.6–33.3		29–30	Obliquity bands
26.8–30.1	21.3–24		22.2–25			19.1–21.5	19.9–22.4	22–24	Precessional bands
26.8–30.1			19.6–22			19.1–21.5		22–24
19.9–22.4		18–20.2	19.6–22	17.5–19.7		17–19.1		19
			17.7–19.9	17.5–19.7		17–19.1		16–17

Present-day component orbital periodicities after Berger (1977); main obliquity term for Toarcian taken from Waltham’s (2015) Milankovitch Calculator; obliquity amplitude modulation (AM) after Hinnov (2000)