Turn structure
Play 1 Marker: place a marker at a Dig Site, take a card to your Study, apply effects, refill the site.
To perform the Play 1 Marker action, you must have at least 1 marker on your Museum board. Step 1: Take 1 marker from your board and place it at a Dig Site that does not already contain one of your markers. Step 2: Take 1 of the 2 faceup cards at that Dig Site and place it in your Study (the area above your board). Step 3: Apply that card's effect (single-use or recurring) and any relevant recurring effects from other cards in your Study. Step 4: Refill the now-empty Dig Site space with the top card of the deck. If you have no markers on your board, you cannot perform this action and must instead Reclaim Markers.
Turn structure
Reclaim Markers: retrieve all markers from Dig Sites; for each, gain 1 amber or display 1 fossil.
To perform the Reclaim Markers action, at least 1 of your markers must currently be at a Dig Site. Step 1: Take all of your markers from all Dig Sites and return them to your Museum board. Step 2: For each marker reclaimed, choose one of two effects: gain 1 amber (from the supply) OR display 1 fossil (see display rules). You may choose a different effect for each marker reclaimed, resolving them in any order you wish. If you have no markers at any Dig Sites, you cannot perform this action and must instead Play 1 Marker.
Restriction
You cannot place a marker at a Dig Site that already contains one of your markers.
When playing a marker, you must choose a Dig Site that does not already contain one of your markers. Each player may have at most one marker per Dig Site at any given time. There is no restriction on placing a marker at a Dig Site occupied by another player's marker.
General
The Study is the area above your board where fossil cards are held before being displayed.
The Study is the zone above your Museum board. Cards in your Study are faceup and their effects (both single-use and recurring) are active while they remain there. Once a card is moved from the Study to the Display (placed facedown below your board), it loses all its effects. Cards in your Study have not yet been scored.
General
The Display is the exhibit area below your board where fossils are placed facedown to score points.
The Display is the zone below your Museum board. It represents your museum's exhibit. Fossil cards placed on display are placed facedown and arranged into sets. A fossil on display loses all its effects permanently. The Display is the primary source of points at end of game.
Resource management
To display a fossil, spend amber equal to its size (1, 2, or 3). Eggs always cost 2 amber.
To put a fossil on display, you must spend amber from your supply equal to that fossil's size: 1 amber for Small (size 1), 2 amber for Medium (size 2), and 3 amber for Large (size 3). Spent amber is returned to the supply. Special rule: Egg cards always cost 2 amber to display, regardless of the size they are acting as. If you cannot pay the full cost, you cannot put that fossil on display.
Building
When displaying a fossil, take it from your Study and place it facedown below your board, either starting a new set or expanding an existing one.
To display a fossil: (1) Pay the amber cost equal to the fossil's size (see display_fossil_cost). (2) Take the card from your Study. (3) Place it facedown below your Museum board. You must either start a new set (place it as the first card in a new row) or expand an existing set (add it to an existing row). Starting a new set earns no points; you must expand a set to score. Once a fossil is assigned to a set, it cannot be reassigned to another set.
Building
Sets are either Family sets (same Family, different Sizes) or Size sets (same Size, different Families). The second card added defines the set type.
There are two types of sets in the Display: (1) Family Set: all cards share the same Family but have different Sizes. (2) Size Set: all cards share the same Size but have different Families. The set type is undefined when only one card is in the row. The second card added to the set determines its type — once defined, the type cannot be changed. You cannot add a card of a different Family to a Family set. You cannot add a card whose Size is already represented in a Family set. You cannot add a card of a different Size to a Size set. You cannot add a card whose Family is already represented in a Size set.