The first few pictures do look like a specimen of a ammonite I have i.d as Protigrammoceras paltum from the Marlstone of the Tilton Railway Cutting. It is a rare as far as a know but is related to the Harpoceras ammos from the Whitby Mudstone Formation. The Whitby Mudstone is present in the midlands but I am not sure if it is in your area. The species Harpoceras serpentinum is the most common type in the midlands Whitby.
The Dacs do look they are from the very top of the Marlstone and are Orthodactylites semicelaum if they are. They are from the same level as the famous Tiltoniceras antiquum ammos and mark the end of the Marlstone before the Whitby Mudstone took over.
Hope that helps and here a picture (sorry about the quality I am getting better at it) of one of my Carboniferous brachiopods. It is a Dictyoclostus semireticulatus. A strophomenid brachiopod from the Lower Carboniferous limestone of the Castleton area.
Good finds you seem to have a knack of finding ammos
Just to continue my last post here are ammonites from the Tilton Railway cutting. Hope it helps with your i.ds Welshy.
The ammo on the left is Tiltoniceras antiquum. It is the zone ammonite for the top of the Marlstone in the midlands but can be found in the Lower Toarcian of North Yorkshire and Germany. The one on the right I think is Protogrammoceras paltum and is the only one I have found. It is similar your fragments in your posts.
No problems Welshy. The Protorammoceras marked the incoming of the Harpoceras that dominated the 'Jet' rock of the Yorkshire coast and they are related to the Tiltoniceras. They are part of the Hildoceratidae family that includes the Hildoceras type. The palaeontographical society did two books on them (part 1 and part 2 - the blue ones). Worth getting if you can find them. The title is The ammonite family Hildoceratidae in the lower Jurassic of Great Britain.
I have posted the two types of brachiopod from my collection found in the Marlstone. They are the green ones form Tilton.
On the left is the Tetrahynchia tetraedra you have found and on the right is the terebratulid Lobothyris punctata.
Look forward to seeing more of your finds
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